Windows & BSOD · critical

How to fix0xC000021A

STATUS_SYSTEM_PROCESS_TERMINATED

What this error means

0xC000021A is a critical-severity Windows operating system problem. A critical user subsystem (such as WinLogon or CSRSS) has been critically terminated. The system cannot continue to run. It's most often caused by incomplete or incorrect installation of update and incompatible third-party software. See the troubleshooting steps below for the fix.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Repair the system with DISM

Repair the system with DISM.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Roll back recent system changes from restore point

Roll back recent system changes from restore point.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Turn off driver signature enforcement in Advanced Boot Options

Turn off driver signature enforcement in Advanced Boot Options.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Incomplete or incorrect installation of update
  • Corrupted system registries
  • Incompatible third-party software