STATUS_SYSTEM_PROCESS_TERMINATED (0xC000021A)

What is 0xC000021A?

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.

Common Causes

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

Step-by-Step Fix Guide

• 1
  Boot from Windows installation media and run Startup Repair

  Startup Repair from a Windows installation USB is the most reliable fix for 0xC000021A caused by failed updates.

• 2
  Run DISM /RestoreHealth from WinPE

  DISM and SFC can repair corrupted system files that replace the legitimate Winlogon or CSRSS processes.

• 3
  System Restore to a point before the issue

  "System Restore to a point before the issue" is worth trying when malware modifying system processes turns out to be the culprit.

Commands & Diagnostics

Frequently Asked Questions