How to: Boot Windows 7 from usb memory stick

Step 1: Format the Drive
Plug in your USB Flash Drive

1. Press Start/ Run/ type ''cmd''
2. In the Command Prompt window type:
   diskpart
   list disk
   The number of your USB drive will listed. I’ll assume that the USB flash drive is disk 1.
3. Replace the number “1” with the number of your disk below.. and then type:
   select disk 1
   clean
   create partition primary
   select partition 1
   active
   format fs=NTFS
   assign
   exit
4. When that is done you’ll have a formatted USB flash drive ready to be made bootable.

Step 2: Copy the installation DVD to the USB drive. 
The easiest way is to use Windows explorer to copy all of the files on your DVD on to the formatted flash drive.  After you’ve copied all of the files the disk you are ready to go.