You'd have to delete the drivers and reinstall them. I was going to but lost my original TNT2 drivers for Win2K. (When I switched back to the old driver in setup OpenGl was still hosed.) I just installed Q3A under Win98. It's much brighter, anyway (it was very dark in Win2K). I just wish it would run in D3D because the 3d Glasses add a lot, & don't work in OpenGl.