GE-Force 3 HELP!

i have an elsi gladiac 920 and am starting to get problems when playing games. i just bought a new game and am now getting z buffer problems can anyone help please!
i have the detonator 40.71 installed! Aslo when i try to run 3DMarks2001 it tell me it cant find a 3d accelerator?

help please someone

cheers!