Step 1: Format the USB Drive
diskpart
list disk
select disk [USB DISK NUMBER]
clean
create partition primary
active
format fs=ntfs quick
assign
exit
Step 2: Make the USB Drive bootable
cd [WINDOWS INSTALLATION FOLDER]\boot
bootsect.exe /nt60 g:
Step 4: Copy The Installer Files
xcopy [WINDOWS INSTALLATION FOLDER]\boot\*.* [USB DISK]: /e /f /h