do you know what kinda video card you have?
nvidia: nvidia.com, download dentonator
radeon, rage, ati anything: ati.com, look for drivers
s3, stealth, monster, viper, diamond: sonicblue.com, go to legacy under support (did any of these even have opengl? i think viper did)
those are like the major ones you'll find around today
its simple really... if you don't know what you have, in your control panel, open system, and go to the hardware tab, and click device manager... the submenu 'display adaptor' will tell you what you have... just go to the website of your card manufacturer, and look for support/downloads, or drivers... make sure you ONLy download drivers for YOUR card