How to Fix Fatal System Error c000021a
This particular error type is what is called a Stop Error or Blue Screen of Death (BSOD) error, they aren’t the most common error types, but they do occur, from time to time. The fatal system error c000021a occurs when the Windows kernel (which is an integral system component), detects that the Winlogon.exe or Csrss.exe services have crashed or stopped. When this occurs, the operating system is immediately halted, while generating the following fatal system error message.