How to prepare a USB storage device as an Installation source for Windows

We will use Diskpart Utility to Perform this operation

1. If you don’t have Diskpart, you can download it here.
2. Launch the DiskPart utility by typing diskpart at the Start Menu.
3. Then run the list disk command to check the status of your drive.
4. Now run select disk 1 where the "1" is the corresponding number of your USB drive (hint: use the size column to match up your drives).

5. Run clean.
6. Once the drive is clean, you can run create partition primary.
7. Now make the partition active by entering active
8. Set up the file system as Fat32 by running format fs=fat32 quick.
9. Enter assign to give the USB drive a drive letter
10. Copy everything from a Windows 7 or Windows Server 2008 R2 .ISO image or DVD media onto the USB drive.

Make sure your BIOS supports booting off a USB device.