Try this. Go to Start, Run, and type win.ini. Look for a line that reads, DVA=0. Put a semi-colon (;), in front of the line. Save changes, exit, and reboot. See what happens.
If it doesn’t work, and there was a previous video card on this system before the M64, try this. Go to Start, Run, and type regedit. Follow this key string (slow & carefull, don’t make any other changes). HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\OpenGLdrivers. There should be an entry for (Default) & RIVATNT. If there are any others, delete everything EXCEPT, (Default) & RIVATNT. Exit, press F5 key, and reboot. Good luck.