extract iso or create iso with extracted files
format drive to fat fat 16 fat32 ntfs which ever it matters not
usb can be any size
get a copy of ultra iso
open iso image in ultra iso
write or burn image to disc
works lke a charm on any usb....any pe everytime
i always use this method when all other methods fail and this pe gave me some problems on ceartain usb sticks but not with ultra iso installation.