I am having problems running Forsaken, Half-Life, Quake II, and Unreal on my system.

I have a PII 450, 96Mb SDRAM, and the V770 (32mb). Supposedly the V770 supports OpenGL and DirectX, but any application that utilizes this will nopt run. I can start the program, but after that it locks up. I have tried everything I can think of. Thanks.