Installing Windows 7 from USB

just found the most simple way to make a bootable USB flash drive for windows installation..
I was facing errors like "Missing Operating System" ,etc..

The simple answer to usb booting is:

1. Extract windows installation files to usb root.

2. Make USB drive bootable by running this:
      BOOTSECT.EXE /nt60 X: /force /mbr
where x: is your usb flash drive.