Open GL keeps freezing up and locking system.

OpenGL tends to lock up most games I have approximately 12 seconds into them (especially Homeworld and Cataclysm). Half-life also has issues with Open Gl but not Direct 3d.

Why are there so many issues with this? I have a Geforce2 Leadtek Card 32 MB GTS as does DR Death and am VERY dissapointed with its performance issues… Any suggestions for fix?