Well, I made the mistake of applying the compatibility upgrade to Win 2K and I lost all 3d in my games. I am not sure that this is the reason that I lost 3d, but the timing is perfect.
 
Now all games either state that no 3d hardware is found, or they run in software rendered mode.
 
I've tried installing numerous versions of the drivers, but so far no luck.
 
I've tried this site (lots of good info), http://win2kgames.com/ (also good info),
microsoft.public.win2000.games (no luck), http://www.reactorcritical.com/ (also lots of info),
I even got to the point of trying game dealers like http://www.shop-gamedealer.com with no luck. I did pick up a copy of UT, so I need to fix this before it arrives
 
My specs:
Dell PIII 600mhz
256MB RAM
TNT 770 Ultra
Win 2000
 
If you have any ideas, please let me know.
 
Rob