How to Fix Ahcix64s.sys BSOD Error in Windows?

Ahcix64s.sys is a system driver associated with the RAID controller for AHCI (Advanced Host Controller Interface). AHCI is a standard that describes how SATA devices communicate with computers. Meanwhile, RAID is a technology that combines multiple physical drives into a single unit for increased performance.

The Ahcix64s.sys driver manages the RAID setups. Therefore, it is a critical driver, and it should not be corrupted. Otherwise, it will result in a BSOD (Blue Screen Of Death) error. 

This issue is mostly caused by the AMD RAID controller driver, but it can also occur with other RAID controller drivers, such as Intel. While the issue is primarily due to a corrupted RAID controller driver related to AHCI, it can also arise from incorrect BIOS settings.

Since we have discussed the causes, let’s jump to the solutions to this issue.

1. Reinstall the driver

As we already mentioned, a corrupted RAID controller driver related to AHCI often causes this issue. Therefore, you should start troubleshooting by reinstalling the Ahcix64s.sys driver.

If you can boot your Windows normally, you can simply follow the steps below to reinstall the Ahcix64s.sys driver. Otherwise, you can boot into Safe Mode by following the steps listed in the composed article.

1. Press the Win key and type Device Manager.
2. Hit Enter to open it on your Windows.
   
3. Expand Storage Controllers and right-click the RAID Controller Driver whether it is AMD or Intel.
4. Then, click Uninstall device.
   
5. Once again, click Uninstall to confirm.
6. Now, go to the motherboard manufacturer’s website and download the chipset drivers.
   
7. Once done, install them on your PC.
8. This should resolve the issue. 

2. Use the System Restore utility

You can also restore the corrupted Ahcix64s.sys driver by restoring Windows to a previous state. If you are familiar with the System Restore utility, then you would know it is a troubleshooting utility that takes a snapshot of system files, registry values, and drivers. Therefore, we highly recommend you use the System Restore utility if you have created a restore point.

1. Turn off your computer completely and turn it back on.
2. When you see a Windows logo, press the Power button to turn off the computer.
3. Repeat this step at least 3 times to trigger the Automatic Repair Window.
4. Click Advanced Options > Troubleshoot > System Restore Utility.
   
5. Click Next and select a restore point created before you encountered this issue.
   
6. Once done, click Next and click Finish to start the restoring process.
   

3. Reset Motherboard BIOS settings

Before we suggest resetting or reinstalling Windows, you can try resetting the motherboard settings. Misconfigured BIOS settings might be the reason why you are encountering this issue. Therefore, make sure to reset the motherboard BIOS settings before moving down to resetting or reinstalling Windows.

1. Completely turn off the computer.
2. Then, turn it back on.
3. As soon as you see the manufacturer’s logo, start pressing the key that takes you to the BIOS settings. Usually, the F2 and Delete keys access the BIOS settings.
4. Once you have accessed the BIOS settings, simply find and press the key that resets the BIOS settings or click the Reset icon.
   
5. Once done, check if the issue is resolved.

Finally, if the above methods do not work for you, you can proceed to reset or reinstall Windows, which will surely fix the issue.