You rip your onboard video a new one. And buy a new video card. If not, you could set the screen resolution to 320x200, turn off all texture filtering, fog, lighting, along with any other settings, set the field-of-view to 0 degrees, and set the draw distance to 0.0000001. That would make the game run faster, but you wouldn't be able to see anything with the tiny draw distance and field-of-view. In short: onboard video is a disgrace to society! How on earth did you get so ripped off like that?
My video card is an ATI Radeon X1800 series. It means I don't have to pull the settings all the way down, but rather, all the way up.