660ti Acting Weird

hey guys

i was getting alot of nvidia driver crashes with my old card GTX275

so i brought a GTX660ti it was working fine for a few days
but now i still get driver crashes (they stop responding)
i have reinstalled the drivers a few times
but im lost
please help  

bf3 = drivers crash
cod4 = works 100%
minecraft = outlines of the blocks glow
dont starve = red dots flashing everywhere
movies = work fine