This looks like a hard “operation” on the USB Hardware, but in truth it’s just formatting a partition on the USB Stick, set the Partition as active and copy all files on it.
So here’s how to:
Create a bootable partition
Open a cmd window; admin rights are maybe required, you’ll be asked on starting diskpart. Enter the following commands to create a primary FAT32 partition marked as active:create partition primary.
diskpart (that’s a command line disk partitioning utility)
list disk (to show up all existing disks)
select disk 1 (where number 1 is the number of your USB Stick)
clean (to clear the existing config)
Now just copy the content of any Windows Installation Media to the USB Stick and boot it.
(found on http://owsug.ca/blogs/…)