What is 0xc000021a & What Causes It
This problem occurs when Windows is updated. So, after the update, it does not start under Windows and displays this ‘blue screen of death’ (BSOD) with an error. There are two files that are the main cause of this error. These files are:
winlogon.exe : As the file name indicates, this file is responsible for the logon and logoff processes within Windows. This file may be damaged by improper adaptation of system files or third-party software. If this file is corrupted, this error will cause the PC to boot to Windows login.
csrss.exe : The second file that causes this error is Csrss.exe. This .exe file belongs to Microsoft Server or Client. This file can also be damaged by this error.