Format the USB
Run CMD.EXE and type the following.
Note: This set of commands assumes that the USB flash drive is addressed as disk 1, you should double check that by doing a list of the disks (type list disk) before cleaning it. If you have multiple hard drives, like an SDFlash drive or a Multibay drive, you could end up wiping your second drive using this command.
- diskpart
- select disk 1
- clean
- create partition primary
- select partition 1
- active
- format fs=fat32
- assign
- exit
Copy Windows Vista/7 DVD ROM content to the USB Flash Drive
xcopy [Device]:\*.* /s/e/f [Flash]:\
Or you can download Windows 7 USB-DVD Download Tool.