# Start -> Run -> type ‘diskpart’ without quotes
# Once it’s loaded type:
This will display the current connected disks.
# now type:
select disk # (you need to replace # with the disk number you want to select).
create partition primary
select partition 1
press enter and then type ‘active’
# We are now going to format the drive, so make sure you have selected the right disk and that there is no data you want to save on the USB drive.
format fs=fat32 quick
# Now assign a drive letter to the formatted drive, typ:
assign and then type exit
You now need to copy the installation files for i.e. windows 8.
You are done, now plug in the USB drive in any laptop / pc and boot it from the USB drive.