hey is the usb put into the computer is my first question? second please stay with on topic open new ones wont help you faster.
small suggestion reboot your computer and hit f2 or f12 or witch button you have on your computer to be able to get into boot menu from there your usb should be there. chance the usb to first place save and reboot. does this solve the problem with the usb? after the reboot can you get a frst log from the guide that have been posted earlier in this topic?