Quake III Help "OpenGL"

I need help my neck hurts for trying to find good help, I hope somebody can help. I have Quake III on my system but just recently, I get the follow message when i go to “Play Quake III Now” from the start menu
“could not load OpenGL subsystem” before I get it, the screen turns black then it just takes me back to the desktop. Anybody know how I can fix it? Any suggestion or answer will be very appreciated

this is an opengl development message board, not q3 tech support. you should go to www.activision.com for q3 tech support.