OpenGl unstable

hi, I have a voodoo2 3DFX card.
Since I had my computer upgraded to a 650Mhz Duron The openGL option seems to be unstable,
If I play Soldur of fortune, star trek elite force or Half-life, (all games witch never had problems before) I can play fine, But if I try to quit or change settings The screen goes dark (not black)and the system hangs…
If I try installing the latest drivers, after installing it restarts windows and freeses, the only way to get into windows again is thru safe mode. any ideas anyone?
Please help,
JC

Somehow I don’t think it’s OpenGL’s fault =) I had some problems with my Voodoo 3 PCI a while back. Just buy an nVidia. =)

But I never had any problems before, Its since paul upgraded the drivewrs I’ve had the problems…
Besides, I just spent $1,200 on the upgrade, I can’t afford a new card.
Are there any possible solutions?