I have exact the same problem! And we are not the only one, i've searched for this problem on the internet and it only seems to appear when you try to install windows 7 on a Asus.
I wanted to install windows 7 and i've booted from a DVD, and i've chosen to install it custom in stead of the option to uprade. Then i've formatted the C disk, i've installed windows and when the setup was finished and i tried to start the computer the error came.
Maybe if I hadn't formatted the C disk the problem didn't apear?