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Blue Screen (BSOD) – common error codes

0xc000021a

Topic #151 · Updated · Pataisoma.lt

Troubleshooting guide

How to fix the problem

0xc000021a is associated with a dead critical Windows user mode process. If it started after an update or program installation, check the Windows recovery environment for the removal of the last update and the correct restore point. Save files before repairing. The /Online DISM command in a recovery environment is not the same as repairing a non-booting Windows.

Possible solutions

Choose the method that matches your situation. Start with the simplest suitable option and check the result. If the problem is fixed, you do not need to continue with the other methods.

  1. Uninstalling the update

    If there is an error after the update, check the possibility of its removal in the recovery environment.

    Steps to follow

    1. If the login window is available, hold Shift and choose Power > Restart. If not, use a ready-made Windows recovery USB > Repair your PC.
    2. Have BitLocker recovery key; menu, select Troubleshoot > Advanced options > Uninstall updates.
    3. If the problem is right after an update, choose to uninstall the last quality update if the system allows it. A copy of the files must be prepared before the restore.
    4. Reboot and test launch. If the option is not available or the drive is unstable, do not try boot commands randomly.

  2. A valid restore point

    If there is an earlier point, use system restore with a copy of the files; offline commands must fit the disk.

    Steps to follow

    1. First, save the files and prepare the BitLocker key. Open Windows Recovery Environment via Shift+Restart or Recovery USB > Repair PC.
    2. Select Troubleshoot > Advanced options > System Restore.
    3. If there is a point before the crash, review the date and affected apps before confirming. If there is no dot, skip this method.
    4. Wait for completion and check if Windows starts. It is not a substitute for backing up your documents.

If the problem persists

If the error occurred after the update, check the possibility of its removal in the recovery environment. Offline repair of system files requires correct Windows disk setup; do not use random commands.

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