I had this same problem and found this thread when I was searching for a solution. It had me pretty freaked out, as there was no apparent way to get out of the blue setup screen where it asks you to hit "enter" to continue. The computer would not respond to the keyboard. Eventually, I just decided to pull the trigger and turn off my mac, as there was nothing else I could do.
When I turned it on again, it started the windows installation all over, but again it would not respond to the enter key when I got to the blue setup screen.
I finally got it to work the third time. I don't know whether the third time's the charm, or it had something to do with taking out the USB extension I had my mouse plugged into (which was plugged into the keyboard). But when I got to the blue installation screen the third time, it worked.
Very nervewracking experience initially, as I did not know where I was going to end up.