Win2000 Pro and Tnt crashes when changing screen res

I hope someone can help with the problem i’m having. Whenever I try and run an Opengl game the screen switches to low res so i can only see the top left corner of the screen and freezes completely. I’m running a Cel700 with 128mb, an 815e intel motherboard, and a Tnt2 Ultra. I’ve tried all sorts of video drivers (Manufacturers, Detonators etc) but nothing helps.

If anyone has any ideas please email me at:-