Install Window 7 or 8 from USB Drive

Install Window 7 or 8 from USB Drive
I’ve seen many sites and blogs to install window 7 from USB but they all are incomplete steps.Main thing to install window 7 from USB is “It takes only 15 minutes.Now I am telling u to install window 7 complete steps that is 100% working.
Reqirements:
USB Drive.
Window 7 files.

Now follow these steps to make bootable USB drive.
Steps:
Plug in ur USB drive to USB port.
Now open cmd with administrator permission.
# Go to Start menu>All Programs>Accessories, then right click on cmd and select run as administrator.
Now First type DISKPART and press enter.
Type LIST DISK command and check ur USB Disk Number(Disk 1 Probably) and u assume ur disk drive “Disk 1”
Now execute following commands one by one:
SELECT DISK 1
CLEAN
CREATE PARTITION PRIMARY
SELECT PARTITION 1
ACTIVE
FORMAT FS=NTFS
ASSIGN
EXIT
Now minimize the command prompt.
Now lets assume your DVD drive letter “H” and USB drive letter “I”(ypur drive letters may be different)
Now type in CMD
H: CD BOOT
(“H” is ur DVD drive letter)
CD BOOT and hit enter.
Type last command to update ur USB with BOOTMGR.
BOOTSECT.EXE /NT60 I:
( “I” is ur USB drive letter)
Now Copy your window 7 files to the USB drive.
Your bootable USB drive is prepare to install window 7.

Just set the boot priority at the bias to USB.If any problem occur then ask me.