Create USB boot disk

C:\> diskpart

DISKPART> list disk

     Select the USB device from the list and substitute the disk number below
     when necessary

DISKPART> select disk 1
DISKPART> clean
DISKPART> create partition primary
DISKPART> select partition 1
DISKPART> active
DISKPART> format fs=fat32
DISKPART> assign
DISKPART> exit

xcopy X:\*.* /s/e/f Y:\

     where X:\ is your mounted image or physical DVD and Y:\ is your USB
     device