video glitches with sli?

I'm running 2 geforce 8800's in sli with nhancer, latest drivers etc ....  When I crash the whole game goes kinda CGA if any of you remember what that is. I'm good enough to know where the save game and exit is but sometime I have to cold restart my whole machine, something I;d rather not do. Oh and turning off sli doesn't seem to help and hardware mouse cursor is on. XP home. Ack, I use 1 turn autosave and quicksave is my friend. Gotta say the game is looking sharper every patch!