overclock?
WARNING!!! This may bust your system!
If you have a fair amount of knowledge about computers and hardware, you can try overclocking your pc... it is risky, because if you do something wrong, you may burn your pc... if you have access to your motherboard, start increasing the multiplied speed. The problem is, that your motherboard can only be tweaked by the jumpers. Your pc is probably configured like this: 66 mHz(bus) x 4.0(multiplier)...if you find the jumper in your motherboard (or the option in the bios, you can access the bios screen when you turn on your pc and you press the 'Del' key in your keyboard, look for the option "voltage and clock frequencies") that allows you to increase the multiplier,and move it to 5.0x. The speed of your pc should increase to 333 mHz. A little faster, no?
Also, you should install Direct X 8.1, the latest drivers for your video card, and an utility for overclocking your video card, Rivatuner, which lets you mess with your Direct X settings and your video card's clock & memory speed(depending of your video card) . After following these, you should notice a slight improvement in your game's speed...
Or, as a last resort, buy a new motherboard & processor, in pages like tigerdirect.com or eBay... there are always good options there.
Just options... it may improve general performance in all games.
"When you were born, you cried, and the world rejoiced. Live your life in such a manner that when you die, the world cries and you rejoice."
- Kabir
I will miss you guys.