The blue screen of death errors occurs whenever the system has a problem that cannot or should not maintain the session. One such case is with:
STOP 0XC000021A, errore STATUS SYSTEM PROCESS TERMINATED
This error indicates that the system files have been changed.
The most likely cause of the problem is a virus or malware affecting the system. However, it may not be the only cause. Another reason could be that a newly installed program has damaged the files.
1] Run a full system virus and malware scan.
2] Uninstall recently installed programs, even if they are important. Check if it helps with the problem. They might be reinstalled later.
Next, proceed to the following solutions:
1] Rebuild BCD and repair MBR
2] Perform an SFC scan
Solution 1] Rebuild BCD and repair MBR
1] Search Symbol of the system in the Windows search bar and right-click on the option. Select Run as administrator.
2] Type the following command and press Enter to execute it:
bootrec / RebuildBcd
3] Now type the following command and hit Enter to run it and get a new bootloader:
bcdboot c:windows /s c:
4] Reboot the system after both commands have been executed.
Solution 2] Run an SFC scan
Since the problem is that the security files on the system have been changed, an SFC scan could be very helpful in solving the problem. This is the procedure for an SFC scan.
Solution 3] CHKDSK scan
A CHKDSK scan helps check for bad sectors on a hard drive. This is the procedure for a CHKDSK scan.
I hope this helps!