This problem has occured on a few Matrox Millennium boards and Diamond Stealth 3D 2000 boards. The workaround is to try a different version of the vendor's video driver or try to use Windows' verion (even VGA/SVGA) of the video driver. One solution for the Matrox Millennium board may be the following: download the latest version of video-driver (v3.70 as of October 3rd) do normal installation deactivate the "Use device bitmap caching" in the "MGA PowerDesk Settings"