S3 ViRGE/DX you've got to be kidding me! This PCI card is years old and only has 2MB (upgradeable to 4MB! wohoo) of video memory. You'll be lucky to get any modern game to run on this. I would suggest getting a PCI FX5200 or FX5700 (unless you have a spare AGP port?) but I suspect the rest of your system might prove a bottleneck if the video card you're trying is anything to go by. The correct process is uninstall your current video drivers, switch off machine, install new card (after making sure you were grounded to prevent static), start up and enter BIOS to disable the onboard card then let the machine boot into Windows and install the drivers. Of course you'll have to plug the VGA monitor lead into the new card output (yes I've seen people fail to do this and wonder why their screen doesn't display anything). If you can give us an idea of the CPU and rest of the system specs to help any further queries.