I just replaced my old Radeon 9800XT Pro video card with a Radeon (Sapphire) HD 3850 512 MB AGP card so I could play Bioshock and other new games. I removed the newer ATI Catalyst control center and installed the one that came with the new video card as well as the new driver. Now when I boot up after the Windows splash screen but before I see the desktop my screen flashes from black to grey a few times then finally loads the desktop. If I try to play Bioshock I get a windows error screen that says Bioshock.exe has encountered a problem and needs to close. We are sorry for the inconvenience. When I try my Half Life 2 game it just wont open and throws me back to the desktop. When I try Call Of Duty 4 it says something like DirectX encountered an unrecoverable error and throws me out. I've uninstalled and reinstalled newer drivers from both ATI And Sapphire with no luck. Also when I'm on web pages (Like this one) I can't scroll down smoothly anymore the screen kind of jumps down refreshing itself as I scroll. Any ideas?