Go to the nVidia website and download the correct drivers. DO NOT INSTALL YET. Remove the current drivers, go to control panel add/remove and you should see them. Shut down computer, remover old video card if one if not currently using intergrated graphics. Install new card in AGP slot. Turn on computer, Win will install a generic driver, so don't worry. Then go to device manager, click on the video card that you just installed, then click on update driver. At this time install the drivers from the location that you downloaded to. Depending on which Win you are using, sometimes when the computer boots up, it will say found new hardware and ask to install drivers at that time. If that is the case, at that time install the new drivers.
3 different OS, so yep I\'m confused.