Have had BSOD issues in Win 8.1 with my setup or whatever, clean formatted and running Win 8 currently. So far so far, only issue being when I alt tab back into a game, I have to click once before the game will recognize any input and it goes MUCH slower than it used to. In the top right the monitor shows that it's almost switching screens cause it'll say DVI each time I alt tab in and out of a game.

How would I fix this?