Damn Quake3 Demo problem (think OpenGl related)

I downloaded the Quake 3 Arena Demo, and installed it perfectly, but when I try to run it, the game crashes at the opening screen (where the Quake 3 Arena Logo is). Does anybody know how to remedy this problem?

Also, I have this program which detects if I have opengl installed, and it says it doesn’t, and I have Windows 98 SE

System specs:

Celeron 400
96 megs Sdram
PC 100 748 motherboard