c000021a STOP Fatal system error out of nowhere.

darkspartenwarrior

Honorable
Jan 15, 2013
323
0
10,810
This computer has been running totally fine for several months, just yesterday it shut down randomly twice, I thought nothing of it, but now today, the computer doesn't even boot windows, it flashes the "Starting Windows" then BSOD and fatal 0xc000021a stop error, and some DLL file has failed. Startup repair does nothing.

I have done nothing since two days ago, when it was perfect, and now. What do I do?