So when I close games sometimes my whole computer starts to crash. Alt-Ctrl-Del. Doesn't work and than I have to force shutdown. When this happens my background (windows 7) turns a faded white gray and the little start menu icon stays normal. I can't click anything and it stays in this state till i turn it off. I just started having this problem and have no clue what can cause it. My video card is fine for the games im playing. It only happens when I close a game. The game stops responding and than boom my whole computer stops. Anyone have an idea why this maybe happening?