Windows up gradation to windows 10 has brought many issues with its introduction. But, when Microsoft started releasing updates, most of the errors and issues were resolved, however on the contrary many issues remain unfixed and unresolved. Installation error 0xc000021a: STATUS_SYSTEM_PROCESS_TERMINATED being one of them.
0xC000021A error appears in a blue screen, which mentions that ‘Your PC ran into a problem and needs to restart’. The reason can be anything. Your PC might have a damaged or corrupted system file. In some cases this error also remains after a system restart.
In many cases, this issue has arrived when users have upgraded to Windows 10. After the update, when the system restarts, the blue screen appears. Winlogon.exe and csrss.exe are two files that are corrupted or missing and hence this error message displays.
There are many solutions to fix this error on Windows 10. All you need to do is try each method one by one and whatever works for you is fine.
This should be the basic thing to do. Using this method we are not actually making any changes to the system, but just fixing/replacing the new files with the old one. For this you need to use the windows 10 installation CD and boot the system. If you do not have the CD you can download Windows 10 ISO from Microsoft website and then make a bootable USB flash drive.