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#21
I know this is a stupid question, but have you flashed the latest bios for your motherboard before attempting the win7 install? Also have you had any usb issues with the computer prior to attempting the install.
Just for kicks go into the bios and set the usb speed to "full" (usb 1.1) instead of "fast" (usb 2.0) and see if that works.
I had a bad chip on an asus board, that was how i figured out the issue and got it RMA'd