Darn, you're not the only who has this problem, Dreama has it too and I'm trying to help her, it seems that NVIDIA didn't make the correct XP drivers, we should mail NVIDIA, because a system like that can run perfectly Jazz2 at 70 FPS.

I just wanna get a new PC to check that actually.

I also was wondering if the solution could be this one:

When you download the XP drivers you download a self extracting file, if you run it it unzips the files and runs the Setup program, but I was thinking..

What about if you unzip the .exe file with WinZip, then install the drivers IN the device manager by clicking "Update Driver", I think that could work, but no idea, give it a try, it could be the solution, good luck!