quick answer f*** it in the bin

just kidding oh nooooooooooooooooooo windows ahhhhhh my head is starting to hurt you need to delete registry keys for the usb so the usb keys can be reinstalled when its plugged back in and which keys are these lol I cant remember all the workarounds its been a while and the windows part of my brain has died sorry mate you can google for the answer
or just burn the iso to dvd drive and boot into bt5 and use fdisk and delete partitions and reformat the usb
if you dont have a dvd drive hmmm i suppose ill ransack my brain for the solution or find a tool that will reinstate the files onto the usb
r083rt