Every time I try to play TR1, it always closes itself, blabbering about Glide error. I have installed nGlide, but nothing happens. This problem also occurs to my 3dfx Unfinished Business. Does anyone know what should I do?

Edit: To be more specific, this happens after I tested the game with GliDOS. I saw it play badly, so I decided to delete GliDOS, then I played it normally, but it always talks about Glide problem. Please help me!

I have seen this error before. It would happen when I tried to adjust the graphic settings to openGL in the configuration tool. I always changed it back to the default.

Edit: Hmm, it seems maybe the error is different than what I was thinking of. The one I got was "Cannot find suitable pixel format". I guess maybe rerun the Launch Graphic Mode Setup utility just incase, and make sure it's set to Direct3D mode.