A couple of things.
1) Make sure you have the latest service packs for W2K installed.
2) For that video card, I would recommend using either the 30.82 or 41.09 NVidia Detonator drivers as the card has no DX9 capabilites. We know these drivers to be the most stable for that line of cards.
If none of that works, then if you could email me the output from DXDIAG, I would be happy to look it over.