Windows Update seems to have rather old nVidia drivers, and this was what gave me problems with Hexagon 2, another program which uses OpenGL. Going the the nVidia website and downloading their lastest driver package makes a big difference. I had, for instance, turned down hardware acceleration to let Poser 6 run on the older driver, but the latest allows me maximum acceleration. I've made a note to be careful about a Quicktime upgrade, but I wouldn't be surprised if the video driver was a factor in that, too.