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Hello,
Many of us face a lot of problem when we have to reinstall windows on our computer or laptop. First thing we have to decide from where to install windows? The options available are DVD or USB Pendrive. In the latest new netbooks, mostly there is no DVD drive. So if you want to install windows you have to go with the other option, i.e. USB Pendrive. So here I give a brief and 100% tested tutorial on how to create a Windows 7 Bootable USB Pendrive to install Windows 7 from USB Pendrive.
First thing, you should check whether your BIOS supports booting from USB. Most of the computer/laptops support. But if your BIOS doesn’t, then sorry, you cannot boot from a USB Pendrive.
Second thing, you need another computer with Windows installed with a DVD drive, to copy its contents later.

So let us start with the procedure now:


1)  Run command prompt (cmd). This can be done by clicking start and typing typing cmd in Windows 7. In Windows Xp, click on start and then click on run. Type cmd and run. This will open the command prompt which will look like this:
3) Now put in your pendrive in a USB port. Your pen drive must be atleast 4 GB, 8 GB pendrive is best for this purpose. Now go back to the diskpart console and type ‘LIST DISK’ and press enter. This will list the various storage devices available. You can see the size column of the disk and here we can see that
‘DISK 2′ is our pen drive. Warning: In your computer it may be some other number. In our case it is ‘DISK 2′

4) Then you have to type ‘SELECT DISK 2′ and press enter. Note: in our case it is disk 2, in your case it may be disk 3, or disk 1 or any other number. You can enter ‘DETAIL DISK’ to see the details of the disk after selecting it to verify that you have selected the correct disk. You can see these steps in the image below:


5) Then you have to run a series of commands. The commands to be run in the order are:-
 -CLEAN
- CREATE PARTITION PRIMARY
- SELECT PARTITION 1
- ACTIVE
- FORMAT FS=FAT32
These steps are shown in the image below:

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6) The format step will take some time. You can have a tea or coffee in the meantime and come back. After the format is complete you have to run ‘assign’ command. And after this you can exit diskpart utility by entering the ‘EXIT’ command. The steps are shown below:
- ASSIGN
- EXIT

- The image below shows all the steps taken from the first step:

7) After the format is complete, put in your original Windows 7 DVD in your DVD drive, or if you have an
.iso image of the DVD, mount that image using any virtual drive software like Power ISO.

- Now go to My Computer, and open the contents of DVD Drive. Press ‘ctrl+a’ to select all contents and copy all the contents by pressing ‘ctrl+c’.
- Now go back to My Computer and open the USB Drive and press ‘ctrl+v’ to paste all the contents of DVD into the USB Disk.