OpenGL & TNT2 M64 & Windows ME

I am currently playing Icewind Dale and Baldur’s Gate, both which requires OpenGl acceration. Sad to say, i have tried downloading the latest drivers for Open GL and also Detonator 3 for my TNT.
Still, the game responds very terribly slow and the system will hang sometime.
Would really appreciate if anybody could help me.
OS: Win ME
TNT 2 M 64