Dear Friends,
Many of my friends don’t know how to install Win7 from a USB drive. Some of them don’t have DVD drive as most of them are using Netbook. 
So in this tutorial I am giving you a step-by-step procedure to install Windows7 from USB drive. 
It has a number of advantages like
ü  Moving with a USB stick is more convenient.
ü  The overall speed of the installation process will be speedy.
Requirements-
ü  USB flash drive with a minimum capacity of 4 GB.
ü  Windows7 DVD
Steps-
(1)   Plug-in your USB drive.
(2)   Open the command prompt. If you are using Windows7/Vista then open it with administrator rights.
(3)   Navigate to Start >> All Programs >> Accessories >> Right-click on Command Prompt and select Run as administrator.
(4)   In the Command Prompt, type the following command:
              DISKPART
       Now type the following command:
             LIST DISK
 This will show you a list of available disks on your system.
   Now type the command:
           SELECT DISK 1
{Note- Disk 0 is usually the hard disk. In my case, Disk 1 is the USB drive. 
In the above command, 1 is the USB drive number on my computer. If you have a different number on your system then you need to replace 1 with that.}
(5)   Now type the following commands as shown below:
CLEAN
CREATE PARTITION PRIMARY
SELECT PARTITION 1
ACTIVE
FORMAT FS=NTFS QUICK
ASSIGN
EXIT
(6)   Insert the Windows7/Vista installation disc and note down the DRIVE LETTER of your DVD drive. In my computer, it is J. 
Now type the following commands:
J: CD BOOT
CD BOOT
BOOTSECT.EXE /NT60 L:
EXIT
    {Note- L: is my USB drive letter}
(7)   Copy & Paste the contents of your Windows7/Vista disk into the USB drive.
            Done.
  Now your USB drive is all set to boot and install the Windows7/Vista for you. 
  Enjoy. 
{Note- Enable the USB Boot priority option in BIOS settings to install from USB.}
For any clarification please write in.
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Source- http://adminkunal.blogspot.com

 
 
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