Just installed a PCI NVidia TNT2 card in machine with an SIS 530 chipset. All Open GL screen savers now cause an illegal operation in the file nvopengl.dll. Also, executing some 3D functions causes the video to shutdown completely. I've tried updating to the latest drivers, but it still does the same thing.

Could it be a problem with the integrated SIS 530 video chipset? In the BIOS I've set the share memory size to NONE (hopefully this disables it). Windows device manager still shows it as being present but with an error. I've also tried disabling the SIS 530 display adaptor in the current hardware profile, but still no joy.

Any ideas??