Try loading it up then once it starts hanging, unplug the USB and plug it back in. Wait and see if the light on it starts flashing. If it doesn't start flashing after about a minute, try unplug/replug again. Try this cycle a few times until it gets to the bit where you select the language etc. Hit 'install' then it will probably hang again, do the same thing. Should work in the end; seems like a bug as the same thing happened (and the same thing fixed it) on two of my machines.