hello i have had a lot of problems with usbbootwatcher i tried to do according to the instruction but it didn't work BSOD everytime after the restart i even used psexec -i -d cmd.exe to elevate bootwatcher and still gave me BSOD finally after a lot of search i found another easy method to install xp to usb i tried it and it worked smoothly. thanks for the help though. here i share the url http://www.diy-computer-repairs.com/install-xp-usb/