The reason for that error is quite simpler. You must have plugged the windows 7 usb drive into a USB 3.0 port. Just change the port and recommence the installation process. I learnt this the hard way. Lost all me docs
Hey Broo why don't you go this a bit faster? Especially for those who are trying to learn how to. Wasting your effort like so many other "tutorials" going blazing fast. Don't show of your file manipulations skills online if you want to make a "how to"