0xc000021a is disk read error and comes when you install fresh windows 10 and it would not install correctly which missing files or corrupted files.
Sometimes, during upgrades and it occurs.
First start your computer and open automatic repair window & choose advanced options >> CMD
Now check disk errors by typing command:-
Chkdsk /f /r
It will take time, so wait for full process. Now, you have to download required files but it will automatic process, in which, repair setting compare your existing files to online. It will automatic import required files in system.
Type below commands to compare:-
Dism /online /cleanup-image /restorehealth
Above command will restore files when you restart your computer next time.
For this, you need windows 10 disk, run it on your pc and restart; it will start setup and now choose repair setup and follow all instructions.
It is easiest way to do