poor Riva 128 OpenGL Help!!

I´ve got a problem with opengl in my Velocity 128 since I first tried to use it. It lacks image quality and i´ve noticed it doesn´t draw tranparent textures in some games (ex.: hitman, unreal). I´ve done my best searching for patches and everything. I´m using the nVidia 3.37 ref. drivers, which I think are the latest. Can anybody help? Please, if ya know of something, post it. Thanx a lot.