Hi, I recently replaced a NVIDIA video card with an ATI video card. I used DriverCleaner to remove all of the old drivers. The new ATI video card works fine the first time I power the computer up after installing. I can load the new drivers and everything looks fine until I reboot the computer. Everytime I reboot, the new video card stops working and I have to put the old NVIDIA card in for the computer to display anything. I am running windows xp. Please help!