WinXP should already have a driver built in for it. If you want all the tools and stuff, you can pay for Windrivers, or simply go here: <a href="http://www.voodoofiles.com/3dfxhelp.asp" target="_blank">http://www.voodoofiles.com/3dfxhelp.asp</a>
The link to drivers is near the top, right under the heading
Original 3dfx and 3rd Party Post 3dfx Drivers and Tweaks: