I have a 1.8 p4 running on win2k. I started with the same video card, but I dumped it for a gforce 3 ti-200. Make sure you have up to date drivers for your vid card, and directx 8.1a from microsoft. The video card is kinda lame, if you can afford a better (non mx) card, you will find your system rock solid and able to handle huge crowds with smoke etc. I currently run 512 pc133 memory, the gforece3 ti-200, with resolution at 1024x768 (32bit) on a 19" monitor, sometimes i bump res up higher, but frame rate does take a bit of a hit at highest resolutions. You should be able to achieve 85 fps (monitor's max refresh rate) pretty regularly with the p4 1.8....but again, the gforce 2 mx card is a limiter. Mine is gathering dust, maybe someday I can start an artifical reef with video cards I have replaced. But even with the mx you should get better rates at the tower - sounds like your drivers may be the ones that came with the system.
Later, bockk