with about any CPU above 1ghz (AMD or Intel), the biggest determining factor on the 2001 score is your graphics card. I have a Radeon LE (32mb) and I get about 3000 with winXP and the latest radeon drivers. The GeForce2 mx-200 benches a fair bit lower than the 32mb Radeon, so your scores sound about right to me. I am assuming you ran 1024x768 32bit. I would not worry about it, as long as it plays your games... If you are really upset, you can pick up a GeForce 3 for about $300 or a Radeon 8500 for about $236, and with that kind of system and fast ram.... you would be cruising. But like I said, as long as it plays your games and runs your programs, I would not worry about it.
Oh, just to add, my friend who has a GeForce2 Pro 64mb gets about 3700 with winXP, so you should not even be close to that score. He runs a 1.33 athlon and I am running a 1.53 athlonXP. Anyway, hope that helps