TNT2 Probs

I have an Nvidia Riva TNT2 PCI 32 MB graphics card, that normally supports OpenGL, I downloaded it from http://www.glsetup.com en insalled it, now, when I want to start Operation Flashpoint in Glide, it still reports an error : no Glide3x.dll present - cannot run Glide version. What should I do ??? help please