How to Fix Windows Defender Error 0x800106ba

This error 0x800106ba  comes up when windows  fails  to initialize the defender application. When you try to run Windows Defender, this is what you will get “Windows Defender: Application failed to initialize: 0x800106ba” OR “Application failed to initialize: 0x800106ba. A Problem caused Windows Defender to stop. To start the service, restart your computer or search Help and Support on how to start a service manually”

The way Microsoft has designed Security Essentials and Defender is that if Security Essentials is running,  then the defender will be turned off. If you wish to run defender, but have essentials installed, then you will first need to remove essentials (that’s the first step in troubleshooting this). However, essentials is better then defender so if you take my advise, there is no need to dig into defending defender if Security Essentials is working properly.

If you are still worried about running Defender, i would suggest getting the AVG Anti-Virus Free application which will do the defenders job, but again you should only run one anti-virus at a time. Running more then one will cause issues when multiple programs are scanning same files, it’ll be a mess.

Now if you want to go with Defender then follow these methods below:

Method 1: Register the DLLs

1. Hold windows key and press R

2. In the run dialog, type regsvr32 wuapi.dll and Click OK

3. Repeat steps for the following dll’s, replace the dll file with the following and register all of them.

wuaueng.dll, wucltui.dll, wups.dll, wuweb.dll, atl.dll, Softpub.dll, Wintrust.dll, Initpki.dll.

4. Once done, disable all other anti-virus applications on your computer and try opening the Defender application.

Method 2: Uninstalling/ Disabling Third-Party Antivirus Program

If you want have two a third-party antivirus program but you want Windows Defender be at first in performing its tasks, you need to disable or uninstall it in order to avoid conflicts. Make sure that you uninstall each and every bit. It is better to restart your computer after the uninstallation process in finished. You can also try to disable the third-party program but sometimes, only disabling the third-part program doesn’t do the remedy. So, uninstalling it does the work.

Method 3: Setting Windows Defender Service to Automatic

As Windows Defender is a built-in program in Microsoft Windows, so setting its service to automatic instead of manual is a lil bit tricky. Follow the steps below to set it up.

  1. Click on Cortana search box and type Services. Right click over the Services application and run it as administrator. The services application displays a list of Windows services which are either running or disabled.
  2. Navigate through the list to find Windows Defender Services. It should say Running under Status and Automatic under Startup Type. If it doesn’t, right click over it and select Properties. Set the Startup type to Automatic and start the service by clicking the Start Restart your PC in order to apply effects. Check for Windows Defender error by scanning your local drives.


Kevin Arrows

Kevin is a dynamic and self-motivated information technology professional, with a Thorough knowledge of all facets pertaining to network infrastructure design, implementation and administration. Superior record of delivering simultaneous large-scale mission critical projects on time and under budget.
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How to Fix Windows Defender Error 0x800106ba

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