My friend had this video card lying around, he got it for cheap and figured out he didn't have a PCIe port. It is a Radion X600Pro. I put the card in, installed the drivers from the ATI site. Everything looks fine except for when my screen saver goes up and I take it off theres rectangles on my screen for a while, like a checker board, it also does it when im asked for User Access Control. And worse of all when I try to run a game it either crashes at the menu, or crashes short after I start the game. The short time that I have the game running has all the models to be stringy or something, also there is often those checkered rectangles in the menus. If anyone knows what the problem is, please help. I have tried uninstalling and reinstalling drivers and everything like that. I am running windows vista and again the card is a Radion X600Pro and its in a PCIe slot.