Okay, I don't know why the .bat isn't running, but you've helped us a great deal just by telling us you're running Windows 7. Microsoft... 1 step forward, 2 steps back.
Anyways, OneShot knows the installer better, since he made it, so I've asked him to take a look. If we can't figure anything out, one thing I can try is to make the graphics package available as a separate download, which in theory would allow you to run that part of the installation manually... Assuming cmputil.exe isn't being prevented from running.
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