Original post : 0xC000021A - Fix for XP, Vista, 7, 8, 8.1, 10, and Windows 11.
STOP: c000021a {Fatal System Error} The Windows SubSystem system process terminated unexpectedly with a status of 0xc0000005. The system has been shut down.
If you're not able to boot into Safe Mode, go to Fix 0xC000021A with Easy Recovery Essentials to fix this error automatically using Easy Recovery Essentials. You can run EasyRE from any CD, DVD or USB drive.
%systemroot%\system32\restore\rstrui.exe
If you don't have the original DVD, go to Fix 0xC000021A with Easy Recovery Essentials. EasyRE can automatically fix this error.
If you can't boot into Safe Mode to run System Restore, go to Fix 0xC000021A with Easy Recovery Essentials. EasyRE can fix this error and you can run EasyRE from any CDs, DVDs or USB drives.
rstrui.exe
dism
dism /image:C:\ /cleanup-image /revertpendingactions
C:
If you can't boot into your system because of the boot error, go to Fix 0xC000021A with Easy Recovery Essentials.
msconfig
cd C:\Windows\WinSxS
move pending.xml pending.old
If you can't run System Restore, go to Fix 0xC000021A with Easy Recovery Essentials.
System Root\System32\Drwtsn32.exe -I
System Root\System32\Drwtsn32.exe
C:\Documents and Settings\All Users.WINNT\Application Data\Microsoft\Dr Watson