Windows & BSOD · critical

How to fix0xC000021A

STATUS_SYSTEM_PROCESS_TERMINATED (0xC000021A)

What this error means

STATUS_SYSTEM_PROCESS_TERMINATED (0xC000021A) (0xC000021A) is a critical-severity fault affecting the Windows operating system. Error 0xC000021A occurs when a critical user-mode subsystem process (Winlogon.exe or CSRSS.exe) terminates unexpectedly. Windows immediately issues a BSOD because these processes cannot safely terminate. This is often seen during Windows upgrades, after corrupt Windows updates, or when system files are replaced by malware. Work through the steps below in order.

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
01Boot from Windows installation media and run Startup Repair

Boot from Windows installation media and run Startup Repair.

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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02Run DISM /RestoreHealth from WinPE

Run DISM /RestoreHealth from WinPE.

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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03System Restore to a point before the issue

System Restore to a point before the issue.

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

  • Corrupt Winlogon.exe or CSRSS.exe
  • Failed Windows feature update
  • Malware modifying system processes