What Is Error 0xc0000021a?

Asked By 10 points N/A Posted on -

I have updated many of my friend’s laptops from windows 8 to windows 10. Yesterday when I tried to update one of my friend’s laptop I got a blue screen with error 0xc0000021a. I don’t understand what mistake I have done in installation. Can you help me out to get this resolved?

Answered By 10 points N/A #322498

What Is Error 0xc0000021a?


The error can occur due to the missing of any of the following files winlogon.exe or csrss.exe. These files are related to windows server and login and logout activities. Run a scan and replace the corrupt files with new ones and try again. Sometimes booting the windows manually also help this problem. If a normal scan won’t help out try to scan using System File Checker. You can also try by resetting the BIOS. Disk drivers should also be checked to solve this.

Answered By 590285 points N/A #327708

What Is Error 0xc0000021a?


You may receive error code “0xc000021a” on Windows 10 which causes a blue screen error or BSOD. This error is normally caused by one of these two (2) files:

  • winlogon.exe
  • csrss.exe

The “winlogon.exe” program or service manages the logon and log off process on Microsoft Windows 10. The “csrss.exe” file is a core operating system file that handles the graphical instruction in the operating system. If you receive this error, it is possible that one of these files is corrupt, deleted, or has been replaced by 3rd party software.

To fix the problem, insert your Windows 10 installation DVD on your optical drive then restart the computer and boot with your DVD. Go to “Troubleshoot”, “Advanced options” then select “Command Prompt”. In the command prompt, type the following command then hit Enter:

chkdsk c: /f /r

If this doesn’t work, repeat the same steps to go to “Advanced options” then select “Startup Repair”. This will scan your computer and fixes any startup-related issue. When repair is finished, remove the Windows 10 installation DVD then restart the computer.

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