Almark,
You should not be running 12.41 or any of the 12.xx series drivers on your TnT Riva 1 or 2 card, ESPECIALLY under Windows 2000. nVidia really need to actually try out their drivers on these cards and they'll realize that TnT Riva 1+2 users need 6.47, 6.49, or 6.67 (Depending on your computer).
Please download the driver for your card I list on my help page:
www.feldoncentral.com/Sachs/help.html