How to fix Windows 10 error 0xc000021a


Windows has two user mode subsystems, the uninterrupted and uncompromised of which are very important. These two subsystem are the WinLogon and the Client Server-Run Time Subsystem (CSRSS). For Windows to work perfectly, these subsystems must work uninterruptedly. When these subsystems are compromised, the error code 0xc000021a occurs.

This error is a BSOD error or a Blue Screen of Death error. There are two things that can cause this error. These reasons are as follows:

There are many ways that can be adopted in order to solve the error 0xc000021a Windows 10. Here we are going to discuss these solutions for the error 0xc000021a Windows 10 Fix:

Clean Booting the System

This is the best solution for fixing the error code 0xc000021a. If clean booting works, then it can troubleshoot this error in-depth. Follow the steps below to clean boot your system:




System Configuration General Tab


Untick Load startup item

Uninstalling Software or Drivers

Sometimes the fault might lie in the newly installed software or drivers. A newly installed software or driver can cause this error. This is because these software and drivers might not be compatible with your Windows version. However, you can simple uninstall these software and drivers and then check whether the problem has been solved or not.

To solve the error code 0xc000021a problem, you need to boot into your system. However, if the BSoD makes it impossible to access your system, then you should try booting in the Safe Mode. You can then uninstall the newly installed software and drivers in the Safe Mode. To enter into the Safe Mode with original disc, the steps are as follows:


Repair Your Computer


Advance Option For Fix Error Code 0xc0000001


Startup Setting

By DISM command

The DISM command can also help in the 0xc000021a windows 10 fix. To run the DISM command, you have to boot the system into Safe Mode through Command Prompt. Follow the steps given below to solve the error:


Advance Option For Fix Error Code 0xc0000001


Startup Setting


DISM Command

System Restore

You can revert your system to its state at an earlier point of time if you have the System Restore enabled on your Windows 10 to stop code 0xc000021a. If you cannot run the System restore option, then you should go with the Easy Recovery Essentials option. To do so, follow the steps below:


Advance Option For Fix Error Code 0xc0000001


System restore


Next for System Restore

This will restore your system to a previous state and remove the error code 0xc000021a.

Disabled Driver Signature

The Windows 10 system will use the drivers which are not signed by Microsoft directly if the Driver Signature has been disabled. If the problem of error code 0xc000021a is arising because of the signed drivers which are loaded during startup, then this fix can help you solve the problem.


Advance Option For Fix Error Code 0xc0000001


System restore


The final method that you can use to apply a 0xc000021a windows 10 fix is to reset the system. It is a solution which should be used only if no other solution works. To rest your computer, the following steps should be followed:


Select Troubleshoot


Reset PC

One thought on “How to fix Windows 10 error 0xc000021a”

  1. illana says:

    A system restore did the trick but what could have happened that my system showed windows error 0xc000021a. Since i barely use this computer other than my grandpa watching some movies in the computer, I am sure the computer was offline and was never connected. There was no installation or changes made so how could this have happened? Cause most of the articles that i have read about Windows 10 error oxc000021a is due to software , drivers

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