HELP!!

Can anybody help me? I just bought a voodo 4 4500 agp. I had a lot of problems setting it up. I went to install it…loading the drivers, then I went to play. Immediately, the game would crash, when I would run it in open gl/glide mode. I downloaded the lastest drivers from 3dfx.com…installed them, and it didn’t work. Games still crashed my computer. So…just as I was about to return my video card, I found this website. I downloaded gl setup and ran it…got the drivers (although it warned me the driver i had was more compatible)…I proceeded. After running it…it installed the drivers…and SUCCESS!!! I was so surprised when everything ran flawlessly. Can anybody explain to me what was going on? I’ve been installing software/drivers/building computers for a while now, so I definately know how to set things up. What was different from the drivers i got from 3dfx.com and from what i got from glsetup?

THANKS!!!