Did you download the files themselves to the flash drive? that could be the problem, if you downloaded the files to the flash drive and are extracting on the flash drive you are kinda duplicating the file, try moving the 81 downloaded files to your desktop. then use win rar to extract them (select all 81 files and extract), then move the file that you get after extracting to your flash drive, that should do it, if it doesn't i don't know whats wrong.
-E60flip