http://download.nvidia.com/Windows/
Up to 71.89 is supported for TNT2

dunno your cpu but preferably take an early driver for old cpus; i also believe i did get some basic acceleration from tnt2 on my xp out of the box;

Tanks for the link, I'll give it a try. Could my display drivers be conflicting with my chipset drivers? It is a SiS 648 AGP x8. When I install the chipset drivers from the ECS website the display detects my monitors native resolution of 1080p (which the TNT2 can display fine, even without the proper Nvidia drivers installed), but I didn't think that would happen for just chipset drivers. My board L4S8A2 doesn't have integrated graphics. Should I not bother with the chipset drivers? Will XPs built in drivers be sufficient?

If it's just for troubleshooting than the driver version doesn't matter much. Otherwise I'd just choose the oldest version which would be 21.83 for the link vetz gave.
Single-digit driver versions are fine or even recommended for TNT2 if you actually want to play games.

I suppose for widescreen support newer drivers are better, though.