try reinstalling drivers. Also check the gpu temperatures.
If problem persist after you install new drivers, you most likely have a bad card that need to be replaced.
Il try that now, but i dont get it some games like Skyrim run on ultra just fine and no crashing but like saints row 2, crashes in 30 min and lines pop up. and my card runs at about 33c not running games and about 45c to 50c when running games on high.Also could it be possible that my new card has the same problems as my old one?? seems kinda weird dont u think