I installed W2K on my IBM Netvista previously installed with WMe. Some of the games don't seem to recognize the video card now (S3 Savage4), although it seems to work properly. Any idea? Something to change in the registry, maybe?

It's not the task of the video card to "recognize" the game. It's the task of the video card, it's current driver, and it's hardware limitations to provide what is required by the game. Please read the specifications for running your game and obtain the required video card with the correct driver. Most games have documentation printed on the box or instruction manual what its' requirements are. Please take the time to check out the specs for your game and video card.
:hdspin:

I know that, and my video card is fine for all the games I have. These games went perfectly well on Windows Me, before I installed W2K. I didn't format my disk before reinstalling Windows, and I didn't desinstall the video card driver either, perhaps that what causes the problem? I tried afterwards to desinstall and reinstall the driver, but it didn't work.