I Really need Help with openGL plz?

I admit it,i am technically illiterate and completely inept at using my computer. i have a voodoo3 and i have no idea why my system won’t play any opengl supported games. i use the open gl setup, download the drivers and after that i am lost. i have bought many games that i cant play and i get just as many ideas from ppl how to fix my problem. i always follow the suggestions up, as far as i know how, but always to no avail. i really do need some help setting this system up so i don’t destroy it entirely. please?
Thanx in advance