Hit F12 when the pc is first starting and it should take you into the boot manager where you can select USB.
Same issue on the Dell Venue 8 Pro, the UEFI is only 32 bit even though the main processor is 64 bit. It means you can only install a 32 bit boot loader, and therefore a 32 bit OS.
thanks, at least that confirms it.
starting to regret not going Lenovo yoga 2, still paid my money and will live with it till I can afford something with a core m in it.