Erez need help said:
One week ago, I could play GLQuake, but when windows updates automatically downloaded and installed service pack 1 on my computer for me, I can't play this game anymore!
First of all, I had the "glide2x.dll is missing from your computer" error. Then I used a software that fixed me the glide2x.dll from "C:\\Windows\\System32", and the error doesn't show anymore, but now I have the following three errors instead:

1. Genport I/O initialization failure
2. grSstSelect: non-existent SST
3. wglCreateContect failed

I can't fix these three errors, no matter what I do. I watched videos in youtube, googling in the internet about fixing opengl in my computer, but none helps. Please I need your help!
Another way to play quack on new computers is using a darkquake based mod called Epsilon Quake. Worth more than a look, this is how I play Quack.
Link: Quake "Epsilon" Build mod - Mod DB