I found a solution!!! For anyone following this thread : I ran the nvidia driver install for the geforce 6000 series card, works great & using hardware open-gl, etc. In windows the video driver is the same as using the 7000 series download, perhaps the 7000 series download is corrupted(?)

I'm seeing program stalls, "not responding" in task manager, application window blanks, then kicks in again after 5-15 seconds. Its also happens with SolidWorks. I've tried different versions of the video driver for my NVidia GeForce 7600 GT (the version specified on the SolidWorks website), still no luck. Adjusted the video settings to lowest, still no luck. The only thing that works is UN-installing the video driver and using the windows default video driver which works but gives poor quality. I'm really stuck, anyone else using this card or have a suggestion?