I bought an ATI Radeon 9800 Pro with 128Mb RAM. I uninstalled ny nVidia card drivers, took out my nVidia card, put the new one in (connecting it to the power source). I turned everything on, and the fan is going around on my card, so it's getting power. The PC didn't detect it (I'm running XP). I went to install the drivers anyway, and it can't complete the installation. My mobo is an ASUS A7N8X-X. I don't get it, I've never had this trouble with nVidia...