Having Problems installing Gainward geForce4 MX440 in Windows XP

[prontospyder]

Yesterday, I removed my ATi Radeon and installed the Gainward geForce4 MX440. Before that, I removed the Radeon drivers and booted into safe mode to remove all ATi registry entries using RegCleaner. After booting back up with the gainward card, I install the Detonator 28.32 drivers with no problems. After rebooting, display properties displays "unknown monitor" and "unknown vga card". I can't change the refresh rate and the 2D is VERY slow. I tried the Gainward supplied drivers and Detonator 28.35's with the same results. Am I doing something wrong here? Should I just reinstall Windows XP? Thanks.