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:

  • Misconfiguration of The Drivers or The Software – The misconfiguration or malfunctioning of the software and any key driver is the most common cause of the occurrence of this error.
  • Damaged System Registry – A system registry might be damaged because of any read/write errors in disk, virus attacks or power outages.

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:

  • Press the keys for ‘Windows + R’ to open the Run window on your screen.
  • Enter the command ‘msconfig’ and press Enter to open the System Configuration window.

 

Msconfig

  • When the System Configuration window opens, go to the General tab.
  • Select the Selective Startup radio button.

 

System Configuration General Tab

  • In the list below that option, un-tick the Load Start-up Items option.

 

Untick Load startup item

  • Now go to the Services tab.
  • Select the Hide all Microsoft Services option at the bottom.
  • Then select the Disable All button on the bottom right.
  • Now go to the Startup tab.
  • Disable all the services that are listed there by right-clicking on each of them and selecting the Disable option.
  • Now restart the system to apply these changes.

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:

  • Insert the disc into the system.
  • Reboot your system.
  • You can now boot from the media by pressing any key.
  • Select the ‘Repair your Computer’ option.

 

Repair Your Computer

  • Now click on Troubleshoot and then select the Advanced Options tab.

 

Advance Option For Fix Error Code 0xc0000001

  • Go to the Startup Settings, then select the Restart option.

 

Startup Setting

  • Press the F4 button to boot into the Safe Mode.

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:

  • Reboot or restart your computer system.
  • When the Windows Logo appears while rebooting, press the F8 key. If the F8 key shows no result, try pressing the ‘Shift + F8’ keys or just the F11 key.
  • Now click on Troubleshoot and then select the Advanced Options tab.

 

Advance Option For Fix Error Code 0xc0000001

  • Go to the Startup Settings, then select the Restart option.

 

Startup Setting

  • To boot into Safe Mode with Command Prompt, press the F6 key.
  • When the Command Prompt window appears, enter the command ‘dism /image:C:\ /cleanup-image /revertpendingactions’.

 

DISM Command

  • Press the Enter Key to run this command.
  • Replace ‘C:’ drive with the drive where your Windows 10 has been installed.
  • The additional commands that you can run here is the ‘cd C:\Windows\WinSxS’ command.
  • Then you have to move pending.xml and pending.old.
  • However, this will only work if there is an already created pending.xml file.

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:

  • Restart/Reboot your system.
  • Press the F8 or the F11 key to boot it in Safe Mode.
  • Now click on Troubleshoot and then select the Advanced Options tab.

 

Advance Option For Fix Error Code 0xc0000001

  • Go to the System Restore option and select the operating system.

 

System restore

  • To enable System Restore, click the Next button.

 

Next for System Restore

  • Select the restore point till which you want your system to be restored and then click on the Next button.
  • Click on the Finish button at the end.
  • When a warning message appears, click the Yes button to proceed.

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.

  • Restart or reboot your computer system.
  • To boot with safe mode, press the F8 or the F11 key during the rebooting process.
  • Now click on Troubleshoot and then select the Advanced Options tab.

 

Advance Option For Fix Error Code 0xc0000001

  • Go to the Startup Settings, then select the Restart option.

 

System restore

  • To boot into Windows with the driver signature disabled, press the F7 key.

Reset

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:

  • Reboot or Restart your system.
  • To boot with safe mode, press the F8 or the F11 key during the rebooting process.
  • Click on the Troubleshoot option.

 

Select Troubleshoot

  • Now select the Reset your PC option.

 

Reset PC

  • Then you have to follow the instructions given in order to complete the reset process.

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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