Windows

How to fix error 0xc000021a in Windows 8 and 10

Windows 8/10 had a number of issues at the time when it was first released. After a while, when Microsoft started pushing updates, some errors were solved but there were a plenty of them which weren’t. One of those errors is associated with the hex code 0xc000021a.

It states that Your PC ran into a problem and needs to restart. This error appears inside a blue screen of death. So, it may have some serious issues damaging the internal structure of Windows OS. This error also persists even after restarting the PC. Performing a system restore also doesn’t work. So, you would definitely want to know the reason behind this hilarious error message.

Reasons Behind the Error 0Xc000021A:

This issue arises when Windows is updated. So, after the update, it doesn’t boot to Windows and displays this blue screen of death along with error. There are two files that are the major cause of this error to appear. These files are listed below.

  • winlogon.exe: As the name of the file represents, this file is responsible for the login and logout operations inside Windows. This file can be damaged due to mismatch of System Files or 3rd party softwares. If this file gets damaged, then this error causes the PC to boot to the Windows Login.
  • csrss.exe: The second file causing this error is Csrss.exe. This .exe file belongs to Microsoft server or client. So, this file can also be damaged resulting this error.

0xc00021a

Solutions to Fix the Error 0Xc000021A:

There are a number of solutions to fix this error. Just follow the instruction properly.

Method # 1: Repair Corrupt System Files

Download and run Reimage Plus by clicking here to scan for corrupt files, if corrupt and missing files are found, repair them.

Method # 2: Booting Windows Manually

In order to resolve this problem, you have to boot Windows manually. Booting the Windows in safe mode wouldn’t more in most cases. So, you have to boot it using force drivers to have signature disabled option available inside Advanced Boot Options. To access this option, follow the steps below.

1. Restart the PC from Windows holding the Shift key and clicking on the Restart. If you can’t access the Restart option on your Windows, then you might need to boot through a Windows bootable USB.

0xc00021a-1

2. It will take you to an option screen. Select Troubleshoot to access the advance tools.

0xc00021a-2

3. From the next screen, choose the Advanced option.

0xc00021a-3

4. On the next screen, you will see a plenty of options. All you need to do is to click on Startup Settings as shown in the picture below.

0xc00021a-4

5. On the startup screen, there would be a number of options to select from. Press F7 labeled as Disable driver signature enforcement.

0xc00021a-5

Your PC would restart with the option you selected and now, you can tweak your PC using different options.

Method # 3: Fix the Issue using SFC Scan

If the above mentioned method doesn’t solve your issue, you can use System File Checker Scan in order to resolve issues related to corrupted files causing this error. Follow this link to run a full SFC scan on your PC.

Method # 4: Reset the computer’s BIOS

Many users affected by this issue have reported success with resetting their computers’ BIOS. A computer’s BIOS can be reset by simply removing the CMOS battery from its motherboard for a couple of minutes, although this trick doesn’t work with laptops as their motherboards are not readily accessible. In order to reset your computer’s BIOS, you need to:

  1. Shut the computer down.
  2. Remove any and all power cables from the computer, making sure that the computer’s access to electricity is completely cut off.
  3. Pry open the computer’s chassis.
  4. Locate the computer’s CMOS battery (it will be found somewhere on the computer’s motherboard) and remove
  5. Wait for around 1-2 minutes.
  6. Replace the battery once you have waited for long enough.
  7. Put the computer’s casing back together.
  8. Start the computer up and check to see whether or not it successfully boots into Windows.

Method #5: Repairing Corrupt Files

It is possible that certain files on the hard disk have been corrupted. Therefore, in this step, we will be running some commands in the command prompt in order to repair these files. In order to do that:

    1. Press the “Shift” key and Click on the “Restart” option. If you can’t access the restart option you might have to boot windows through a removable device.
    2. After reboot, click on the “Troubleshoot” button under the “Choose an Option” heading.
      Selecting the “Troubleshoot” option
    3. Click on the “Advanced Options” button and then select the “Command Prompt” button.
    4. Once the command prompt is opened, type in the following command and pressEnter“.
      C:\>dir
    5. Only proceed with the next steps if the following screen is shown.
      Your screen should look like this after executing the command
    6. Now type in the following command and press “Enter”.
      D:
    7. Again, type in the following command and press “Enter”.
      D:\>dir

      Note: Continue checking Directories in the same manner until you find a directory that displays windows’ files. For example, the image below

      This image shows that the files are stored on the “D” directory. Therefore, we will use the “d” word in the upcoming commands.
    8. Now, type in this command and press “Enter”.
      dism /image:d:\ /cleanup-image /revertpendingactions

      Note: Replace “d” with the letter of the drive on which your Windows is installed.

    9. Wait for the process to be completed and type in the following command.
      D:\>exit
    10. Reboot your computer and check to see if the issue persists.

Method # 6: Repairing Disk Drive

In this process, we will be running a “Check Disk” scan to find and fix errors. In order to do that:

  1. Press the “Shift” key and Click on the “Restart” option. If you can’t access the restart option you might have to boot windows through a removable device.
  2. After reboot, click on the “Troubleshoot” button under the “Choose an Option” heading.
    Selecting the “Troubleshoot” option
  3. Click on the “Advanced Options” button and then select the “Command Prompt” button.
  4. Type in “D:” in the command prompt and press “Enter“.
    Note: Type in the letter of the drive on which the Windows files are being stored.
  5. Type in the following command and press “Enter“.
    chk disk /f /r
  6. Just press “Y” if the “Check Disk Scan cannot proceed because the Volume is in use by another process” error shows up.
  7. Wait for the scan to be completed, reboot your computer and check to see if the issue persists.

Method # 7: Replace any and all corrupted registry hive files with backups

Your computer may be affected by this issue because Windows tries to access essential registry hive files when it boots up (like it is supposed to do) but is unable to access them because they have been damaged or corrupted. If that is the case, replacing any and all corrupted registry hive files with their backups should fix the issue. However, since your computer won’t boot up, you can’t replace the damaged registry have files via the File Explorer – you are going to have to do so using a Command Prompt in the Windows Recovery Environment.

In order to get into the Windows Recovery Environment, though, you are going to need a Windows installation USB or disc containing the installation files for the same version of Windows as the one that’s currently installed on your computer. In order to use this method to try and get fix this issue, you need to:

    1. Insert the Windows installation disc or USB into the affected computer and restart
    2. As soon as the computer starts booting up, get into its
  1.  BIOS settings and configure the computer’s boot order to boot from the installation media instead of its HDD/SSD. Instructions for getting into the computer’s BIOS will vary from one computer to the other but will almost always be found at the first screen you see when the computer boots up.
  2. Save the changes and exit the BIOS
  3. If prompted to do so, press any key to boot from the installation media.
  4. Select your language, time zone and keyboard layout preferences and then click on Next.
  5. When you reach a window with an Install now button at its center, look for and click on Repair your computer in the bottom left corner of the window.

You should now arrive at the Startup Options screen. Once you are here, you need to:

  1. Click on Troubleshoot > Advanced options.
  2. Click on Command Prompt, and a Command Prompt will be launched.
  3. Type c: into the Command prompt and press Enter. If Windows is installed on a partition of your computer’s HDD/SSD other than the C drive, replace c with the driver letter that corresponds to the partition of the HDD/SSD that Windows is installed in.
  4. Type cd windows\system32\config into the Command Prompt and press Enter.
  5. Type dir into the Command Prompt and press Enter. The Command Prompt will now display all the files and folders present in the directory.
  6. One by one, for each file (not folder, only file) present in the directory, type the ren (File Name) (File Name).old command and press Enter.

For example: Type in ren SYSTEM SYSTEM.old for the SYSTEM file in the directory, and ren SECURITY SECURITY.old for the SECURITY file in the directory.

 

  1. Once you have renamed each of the files in the directory (creating backups of each of them), type cd RegBack into the Command Prompt and press Enter.
  2. Type dir into the Command Prompt and press Enter. You will now see all of the files and folders present in this directory.
  3. Now type the following commands one by one:

copy /Y SOFTWARE

copy /Y SAM

copy /Y SYSTEM

and any other folder that was renamed, we now need to put the registry hives back for the folders we renamed.

Once done, close the Command Prompt, get out of the Windows Recovery Environment, by typing EXIT and press ENTER remove the Windows installation media and restart the computer to see whether or not it is able to successfully boot up without running into the 0xc000021a screen.

195 Comments

  1. Can you try booting with force drivers to have signature disabled; then check on the manufacturer’s site to see if there are drives available for your OS (10 or 8) which ever you’re using. Thanks

  2. Came across this problem after upgrading to win 10 from 8. And after a few more installations (office, printer, etc).
    It first asked for Bit locker key and after entering the key it went into 0xc000021a loops.
    Am trying different things mentioned online (sfc scan, command prompt> DISM move, reset, image recovery, manual booting).

    However no luck so far 🙁

  3. Neither of the two proposed solutions work. I’ve tried everything I can think of and remain in the BSOD loop.

  4. Are you able to boot into safe mode if you start with the installation media? If this is a desktop, i’d suggest removing the cd/dvd drive, and the wi-fi card/adapter it it’s external. Once you boot into the computer, there will be dmp file in C:windowsminidump which will have more details about the BSOD which we can diagnose. You’ll need to upload it to eQuestions.net

  5. This worked for me. It occurred after I have had Win10 running fine since it was released five months ago. Then, AVG did an update, and that’s what screwed it up. By following the F7 technique above, I got mine working find again. Also, WIn10 was attempting to update at the same time as AVG, so that may have caused it. It is fine now. System Restore did nothing.

  6. I tries te F7 technique several times but no luck my laptop is normally windows 7 but upgraded it to win 10

  7. Hello, I have tried the first method. Unfortunately, it does not seem to work at all. Once I pressed f7 my pc restarted but the problem still remains.

  8. Hello Kevin.. Running Windows 10. I have this error problem. I am thinking of loading Windows 7 from disc and then, try and load 10 again… Is this doable? Will the “problem Windows 10” allow this? Thanks for your help

  9. I am sure that a clean installation will fix it. However, since it has already been upgraded, you can try a clean install of Windows 10. If you can boot to advanced mode, then use the features listed to this other create a bootable windows 10 disc using rufus, and then boot from it to re-install. When you do this, you will not have to re-enter license keys since it is already updated. http://appuals.com/create-windows-10-bootable-usb-with-rufus/ – Do let me know the results as i am keeping track of this issue to help others by noting down solutions that worked.

  10. #1 did not work 4 me. #2 resulted in “Windows Resource Protection could not perform the requested operation.”
    Previously, I reset the PC. Then, I found where restoration is off by default(!), so turned it on. The next restart, it happened again, and the fourth (the oldest) restore worked. But, here we are again! As I’ve just moved, finding install discs is a PITA. Thanks a bunch, Microsoft…NOT!!!
    Even worse: now there are no System Restore points, either. Not just about this “not ready for prime time” case, but Microsoft should spin off it’s OS division into a separate company, maybe their overall reliability as well as simplicity would both improve.

  11. Yes. I just borrowed one. However, I have never created installation media. I just moved, too, so my Windows 7 disc is buried somewhere as well.

  12. You can download Windows 7 ISO. You can also download Windows 10 to repair/run. BUT the error mentioned in this guide is for Windows 8 and 10. Can you open a new with your exact issue on eQuestions.net/ask – i will be able to assist you one to one.

  13. Hello, I am getting this same error code, the only thing that the computer will do is restart over and over, it will not allow me to get into anything else, restore mode will not come on either, it shows on the screen for a brief second, then the blue screen shows up again, and restarts. it will not even let me do anything with boot cd, its like its not even there.
    please help

  14. I am having this problem as well, and I own a Cyber Cafe. The problem is with my master computer and the only way of fixing it was to refresh/reboot. I have done this 4 times over the past month (very frustrating). On the last time, I used Method #1, which worked. My question is this….if my computer shuts off unexpectedly or I do a restart, this is when I get the error code. If I shut down, the computer is fine when I turn it back on. If I did Method #1, has the problem been permanently fixed? or will this error come up again upon a restart? (I’m afraid to try) Thank you.

  15. Are you able to reset windows 10, when you go to reset it from the advanced options, you have the option to keep files or remove files. If i were you and the files weren’t important for me, then i would remove them and do a reinstall.

  16. Okay. I have most of it saved on different external drives, but wanted to check and make sure before everything disappeared.

  17. So on trying this I just get the blue screen again saying it needs to restart after gathering error data. I’m being told now I will probably have to uninstall and reinstall losing files. Any other successes, I’ll be watching.

  18. If you can boot to safe mode, then you copy the files over to the USB. You can also attempt a system restore to a point when the system was actually working without the error through advanced mode.

  19. o have stucked 5 days with this problem of winload.efi error or error 0xc000021a and tried rapidly this solution without sucess, but today i did it step by step
    1) re-start pressing shit button. (and Os selection show up)
    2) using tab in second screen to select other options of boot
    3) disabling driver signature.
    4) my windows 10 start again.
    5 ) im doing now an sfc/ scannow to check erros in admin mode.

    thanks . i have a Sony vaio without recovery working

  20. At my last automatic updates with Win 10 I got a blue screen of death along with error. The killer was error 0xc000021A. After consulting a Pc nerd I was adviced to begin browsing and to search for a solution. At last I came on this page. In a minimum of time I got the device back on te rails again. The bug was fixed fast and well. Btw. at this same moment my mouse gave up, dead. I was mislead and confused by it , so I thought after the correction I had done wrong something but ….a new mouse showed me everything was OK. Tx Kevin for your support with this bothersome problem.

  21. I just had this problem come up again, even after I believed I turned off updates….how can I permanently turn off updates or Permanently repair this issue. I can’t keep reinstalling Windows every couple of weeks! Help me please!

  22. You will need to trace it with trial and error which can be a lengthy process. You can wait a couple of months and re-run updates, hopefully MS will issue a patch or another update to fix it. Until then, just use a good antivirus and a malware software to stay protected. If this error comes back without updates, then that would indicate that it’s not the update but a program changing settings. We’ll check that out when it happens.

  23. Kevin…Thank you, thank you, thank you. You have been a LOT of help in this matter. I am not computer savvy, that’s my brother…when I asked him about this, his response was “I never upgraded to Windows 10, so you are on your own!” Needless to say, I have been upset over this whole ordeal since it started. I am hoping that it is caused by one of the updates and it can be fixed in the future. Lets cross our fingers that I won’t be talking to you too soon that it happened again. Thank you again for your assistance!

  24. Even i got the same problem .I did all the steps as u said .Its restarting but again got the problem wat should i do ?

  25. Even i got the same problem .I did all the steps as u said .Its restarting but again got the problem wat should i do ?

  26. I tried both solutions but don’t work for me .. I’ve to install fresh copy of windows every day! What may be the problem?

  27. I need help. Got the blue screen. (then before i checked here) i tried a system reset. Now it tried to back up files- it stopped and a screen came up that said files could not be read it left a screen that asked me to terminate???? I am a computer dummy, please help.

  28. Hi. Is it normal that after preasing F7 the screen turned black and until now it’s black. Please help. My laptop is not turning on now after pressing F7.

  29. It don’t work with F7 only. I have a x200m asus notebook and i don’t think pressing Fs alone would
    work.

  30. How exactly do i do a complete reinstall – I’ve tried the above options and others and can’t get anything going – i downloaded the windows 10 to a disc I think but the computer wouldn’t boot from the disc – but then again – i’m clueless to some of the in depth details – any set of instructions on exactly how to do a complete clean reinstall? thanks

  31. 1. Download the Windows 10 ISO File.
    2. The download Rufus

    OR Download Media Tool from Microsoft site, download the ISO and then burn it to the usb.

    3. Burn the ISO to the USB or Disc.
    4. Boot your system to BIOS and change the boot order to the boot media.

    If you have access to a usb and a 2nd computer, i can remotely do this for you.

  32. sorry didn’t get a chance to get back to you – got busy yesterday
    i’ll try to download it this morning

  33. i think i got it done correctly – i’ll probably see if i can use the disc tonight and see if it works – thanks for the help – i’ll post up results

  34. the iso disc worked – took a few hours for everything to work through – but so far after spending several hours putting software back on – moving files where I want them the computer and OS seem to be working fine – very time consuming – for those contemplating a fresh new clean install – all your files will be saved in a “windows.old” folder so you won’t lose anything, at least I didn’t

  35. I have a Lenovo Laptop, Windows 10. I TRIED this fix but it still takes me back to the error screen. I also tried to do this but doing Safe mode with the Command Prompt so I can do the scan but it stills goes right back to error screen. PLEASE HELP.

  36. my keyboard doesnt seem to function and i am unable to select f7 from startup settings. pl require urgent help

  37. neither enter key works which will take me back to os as listed. unable to do anything with the pc. data inside which is urgently reqd

  38. when i go for sfc scan gives me a message system repair pending to go back restart and run sfc again. the keyboard works now and accepts text in command prompt. need to recover the system urgent. I tried to reinstall windows from installation CD but it doesnt go to the mode as keyboard now aagain doesnt respond. it responded only in command prompt. pl help

  39. This information saved me!! Clear and easy to understand with the pictures of the steps! Thank you!

  40. Still doesn’t help me:

    The problem goes like this:

    A
    1.) Windows update runs automatically and without any ability to pick and choose what to update;
    2.) Windows boots, dies on blue screen, saying error “0xc000021a”
    3.) Computer restarts, then the troubleshooting options is taken, this is followed, and restart with driver signature disabled.
    4.) Windows crashes again at boot. Blue screen, saying error “0xc000021a”

    B
    1.) I now use system restore instead from trouble shooting.
    2.) System restore works, and it was back before the auto updates are installed
    3.) but since it’s windows forces auto updates and installs all updates without you having the ability to pick and choose – it installs the same thing that crashed the laptop in the first place.
    4.) After enjoying the short life of your OS, you restart, to find windows is auto updating again.
    5.) Windows boots, dies on blue screen, saying error “0xc000021a”
    6.) Repeat B.1 and loop this process.

  41. Do a system restore whilst the PC is disconnected from the internet. After the system restore, go to Windows Updates, and change settings to choose what to install.

  42. ok…. i read various methods and solution to start my pc from solutions provided by you
    and i tried all of them
    1) restarting pc is not helping, then
    2) troubleshooting via restore point is not working (system restore is completed to 100% and when it restart the PC, it leads to same error)
    3) i have system recovery but it’s not working
    4) system reset is also not successful
    5) i got your suggestion to change startup setting and i tried one after another, all the option’s from F1 to F10 but all in vain
    6) last option was cmd, but sfc/scannow leads to (when i go for sfc scan gives me a message system repair pending to go back restart and run sfc again) error

    now i left with the option of fresh installation of windows but the problem is that, i had a bootable disk of genuine windows 7 which i upgraded to windows 10 and now i don’t have any bootable disk of win 10 and windows 7 cd is not working over win 10
    plz suggest some solution.

    thanks in advace

  43. You’ll need to check which drivers are causing it, the blue screen of death would tell the name of the file triggering it. Type that to me here.

  44. It does not give me the option for disabling Driver Signature enforcement it does not even show me the option to enable safe mode. I am on a hp 15 notebook Pc windows 10. I can nor even reach the login screen

  45. I used to be able to reach the advanced options and troubleshooting page. As of later today I am now stuck on a black screen after the windows logo with the words under it

  46. The Win 10 key is in your bios, just install win10 from the free official microsoft ISO and you’ll see your Windows will be activated.

  47. I actually found a fix somewhere else where it instructed me to download this windows 10 windows update-picker, where you can pick and choose which update you want. It was developed by Microsoft. It’s funny that this feature is just some third-party download that is not included build in to windows 10. This add-on for windows update just helped me a lot. What a nonsense from Microsoft as if they realised their fault later on.

  48. I’d like to update my guide with your fix. How did you conclude that you needed to hide / uninstall an update? If you can send me a detailed guide, that will be helpful.

  49. Hi, I am totally not a computer genius so I have to ask this question, how do I get by the blue screen of death to do these fixes?

  50. I can’t get past the blue screen of death step 3 isn’t working and I can’t get past the blue screen to try 1 or 3?? Please help

  51. Take all external devices out of your system, reboot the PC three times, and interrupt the 3 reboot times to boot into the advanced mode. Once in advanced mode, disable driver signatures and then try.

  52. I tried solution 2 which did not work for me. Please my machine won’t even boot how am I to download and use reimage? I have been without my machine for too long now

  53. Hi thank you when i restart it goes directly to repairing your computer then diagnosis then your pc did not start correctly so i go to advance option startup setting and tried all f1 to f7 but does not work back everytime to pc ran into problem collect info then you can restart blue screen flash code and stop code Oxcoooo21a OS 8 OS 10 having this for 4 months and this will be 5th recovery the second for OS10 what shall i do thc

    Note 3 days ago same issue i managed to go back to previuos build ie OS8 it works re upgrade OS10 worked 24h and crash

  54. Can you boot into advanced mode, go to Command Prompt and then type the following commands, then do a reboot and test.

    bootrec /fixmbr

    bootrec /fixboot

    bootrec /rebuildbcd

    Disconnect all external devices connected to it.

  55. Hi there! This is the first time this issue has happened and I am still unsure how to proceed. The first thing that shows is the black screen with the hp logo and right after it shows the blue screen then returns to the black, then blue and so on. What should I do? Thank you!

  56. Reboot the system three times, and before the blue screen appears shut it down using the Power button. The aim is to interrupt the process, such that the Windows should boot into the Advanced Mode. Once it goes to the advanced mode, choose Troubleshoot -> Automatic Repair and repair the system.

  57. I did it it says after typing then enter first one operation completed successfully second one successfully 3rd one litle time scaning all disk for windows installation , sucessfully scanned and total identified Wnidows installation: 0
    Operation complete succesfully so i close the window close the PC and start open direct to your pc ran into problem stop code oxc000021a did it twice…

  58. Try the following:

    Step 1: Type
    cd WindowsSystem32Config

    Step 2: Copy

    copy BCD-Template Temp and Press Enter

    copy COMPONENTS Temp and Press Enter

    copy DEFAULT Temp and Press Enter

    copy SAM Temp and Press Enter

    copy SECURITY Temp and Press Enter

    copy SOFTWARE Temp and Press Enter

    copy SYSTEM Temp and Press Enter

    STEP 3

    ren BCD-Template BCD-Template.bak and Press Enter

    ren COMPONENTS COMPONENTS.bak and Press Enter

    ren DEFAULT DEFAULT.bak and Press Enter

    ren SAM SAM.bak and Press Enter

    ren SOFTWARE SOFTWARE.bak and Press Enter

    ren SECURTY SECURITY.bak and Press Enter

    ren SYSTEM SYSTEM.bak and Press Enter

    STEP 4
    copy C:WindowsSystem32ConfigRegbackBCD-Template C:WindowsSystem32ConfigBCD-Template and Press Enter

    copy C:WindowsSystem32ConfigRegbackCOMPONENTS C:WindowsSystem32ConfigCOMPONENTS and Press Enter

    copy C:WindowsSystem32ConfigRegbackDEFAULT C:WindowsSystem32ConfigDEFAULT and Press Enter

    copy C:WindowsSystem32ConfigRegbackSAM C:WindowsSystem32ConfigSAM and Press Enter

    copy C:WindowsSystem32ConfigRegbackSECURITY C:WindowsSystem32ConfigSECURITY and Press Enter

    copy C:WindowsSystem32ConfigRegbackSOFTWARE C:WindowsSystem32ConfigSOFTWARE and Press Enter

    copy C:WindowsSystem32ConfigRegbackSYSTEM C:WindowsSystem32ConfigSYSTEM and Press Enter

    then test, and let me know.

  59. Thx the list is very long am not computer nerd 50yo in your list i do not know what you mean by copy after first step copy from where or what i must write copy then again copy xxxx enter? I am affraid it is going to be back to shop or can we chat line whatsapp? Thx

  60. Hi, Kevin. I tried all your methods to fix my computer, but they didn’t work. Do you think you can help? Thanks!

  61. I’m not sure how to put my computer in advanced mode. It’s already at the blue screen and I can click “Advanced options”. Do I just need to type this in “Command Prompt”?

    bootrec /fixmbr

    bootrec /fixboot

    bootrec /rebuildbcd

  62. Click Advanced Options, then choose Troubleshoot and then choose Command Prompt.
    Also tell me if there was an update that was installed before the issue started?

  63. The Windows Anniversary update was installed before this happened, but that was a couple of days before. My screen froze one day so I decided to shut it down and now this is occurring. Anyways, I finished the last command, but by reboot does that mean just press the power button and shut it down? Sorry, I’m really bad at this stuff.

  64. Troubleshoot -> Advanced Options -> System Restore -> Select your User Account -> type the password -> choose a restore point to the time when it was working fine.

  65. “No restore points have been created on your computer’s system drive.” I’m sorry nothing is working. :((

  66. Go to command prompt, and do the following:
    Step 1: Type
    cd WindowsSystem32Config

    Step 2: Copy

    copy BCD-Template Temp and Press Enter

    copy COMPONENTS Temp and Press Enter

    copy DEFAULT Temp and Press Enter

    copy SAM Temp and Press Enter

    copy SECURITY Temp and Press Enter

    copy SOFTWARE Temp and Press Enter

    copy SYSTEM Temp and Press Enter

    STEP 3

    ren BCD-Template BCD-Template.bak and Press Enter

    ren COMPONENTS COMPONENTS.bak and Press Enter

    ren DEFAULT DEFAULT.bak and Press Enter

    ren SAM SAM.bak and Press Enter

    ren SOFTWARE SOFTWARE.bak and Press Enter

    ren SECURTY SECURITY.bak and Press Enter

    ren SYSTEM SYSTEM.bak and Press Enter

    STEP 4
    copy C:WindowsSystem32ConfigRegbackBCD-Template C:WindowsSystem32ConfigBCD-Template and Press Enter

    copy C:WindowsSystem32ConfigRegbackCOMPONENTS C:WindowsSystem32ConfigCOMPONENTS and Press Enter

    copy C:WindowsSystem32ConfigRegbackDEFAULT C:WindowsSystem32ConfigDEFAULT and Press Enter

    copy C:WindowsSystem32ConfigRegbackSAM C:WindowsSystem32ConfigSAM and Press Enter

    copy C:WindowsSystem32ConfigRegbackSECURITY C:WindowsSystem32ConfigSECURITY and Press Enter

    copy C:WindowsSystem32ConfigRegbackSOFTWARE C:WindowsSystem32ConfigSOFTWARE and Press Enter

    copy C:WindowsSystem32ConfigRegbackSYSTEM C:WindowsSystem32ConfigSYSTEM and Press Enter

  67. Ugh sorry I accidentally double posted–said I didn’t post it.
    Anyways, I typed the first command and it says “The system cannot find the path specified.”

  68. I can’t do that. Anyways, I thank you so so so much for giving up your time to help me. I really appreciate that. I’ll figure out a way….hopefully. Once again I can’t thank you enough. 🙂

  69. I was presented with the error code 0xc000021a on my laptop – The blue screen of death comes on to the screen everytime the computer boots up and woldnt allow me back in to windows – i tried using the second step above and it hasnt worked – i have also tried the turn ur computer on and off several times as it boots up . at times the computer will “diagnose” itself and then say “automatic repair” but even after that just takes me straight ack on to the blue screen – i dont know what to do im at the end of my rope HELPPPPP

  70. I was presented with the error code 0xc000021a on my laptop – The blue screen of death comes on to the screen everytime the computer boots up and woldnt allow me back in to windows – i tried using the second step above and it hasnt worked – i have also tried the turn ur computer on and off several times as it boots up . at times the computer will “diagnose” itself and then say “automatic repair” but even after that just takes me straight ack on to the blue screen – i dont know what to do im at the end of my rope HELPPPPP MEEEEEE PLEASEEEEE

  71. my little sister was using it – the computer lagged and she banged the keyboard but not very hard because it suddenly froze and then it just crashed – ever since its just been a blue screen that will not let me log on

  72. Sometimes when i turn it on it loads then goes straight to blue screen gives me the error code and tells me that it needs to restart – It does then goes to an automatic repair… diagnosing your pc .. tells me it didnt start properly and gives me the advanced options

  73. Following this it gives the options to continue, turn off pc, use a device or troubleshoot .. when you press troubleshoot it says refresh pc, reset pc or advanced options.

  74. Then its system restore, command prompt, system image recovery, firmware settings, start up repair, start up settings

  75. Hi, I followed your instructions but windows still failed to boot. My regback folder didn’t contain BCD-Template or COMPONENTS so I copied them from another windows 10 laptop, but it still failed.

  76. Hi Kevin Arrows,

    Really thank you about this article, it resolved my problem!!!

    I was using months ago a notebook Asus K52F with w10 Windows 10 when it stopped with this 0xc000021a. I began to use Linux Mint Live CD since it (recommended). But today I needed to resolve it when I saw your page. It worked when I did “…you have to boot it using force drivers to have signature disabled option available inside Advanced Boot Options”. It worked like a charm! Automatic I turned off internet wireless after it, see below why.

    I saw to the link https://www.asus.com/us/support/FAQ/1016000
    What I could understand Asus can stop from hibernation/sleep because sometimes after update windows 10 changes Intel Management Engine Interface driver, resulting a a compatibility error. Then it recommended to download and change the driver.

    I will do it. I hope that it can help others

    Bye!

  77. It would be best to reinstall your windows, speaking from experience if you’ve tried all of the steps mentioned here and the hardware isnt at fault, then reinstalling would be the way to go.

  78. You will need to use another PC to download ISO and burn it onto a USB or a disc, and then change boot order from bios to boot from the media (usb or cd) and then do a reinstall. You can use the license keys you have to activate once it is installed.

  79. I’d suggest you format this drive, on an other PC by connecting it to the other pc using a disk enclosure and then try installing windows, if the disk is faulty, you will know when you connect it to the other pc.

  80. Apologies for the delayed response. What i meant to say is that if you get a Disk Enclosure and copy the data (not clone) to another drive or computer by putting the drive from the computer in question into the enclosure and then once the data is copied, you can then do a clean install.

  81. Can you get to Advanced Mode and do a reboot? Repeatedly interrupt the reboot 2 or 3 times, and it will auto boot into Advanced Mode. From there, do a system restore to the point when everything worked perfectly.

  82. Hi! Can you please share how you did fix this in the end? I am having the same problem and can’t find a way out! cheers

  83. Allegedly MS sends files along with updates to kill older PCs (over 2 years old) those that have not upgraded to their increasingly watchful surveilance state Windows 10. Switching to another OS such as Linux is the way to combat this unconstitutional thing called PLANNED OBSOLESCENCE.

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