Installing Windows 7 from USB

To install Windows 7, 8, Vista from USB Key using command line

1. Open Command line (cmd) Start -->run --> type "cmd" -->hit enter
2. write the following commands in the opened command windows
1. diskpart
2. list disk
3. selct Disk <number>
4. clean
5. create partition primary
6. select partition 1
7. active 
8. format fs=NTFS
9. assign
10. exite
3. Now the USB is bootable and ready to be used. Then copy the Windows file in to the USB either manually or using copy command. copy <sources> <destination> 
4. Then restart the computer and boot from the usb by pressing the booting key. 
5. Enjoy! 

Source:- Internet :-)