How to Create a Bootable Windows USB Drive

step to be followed :

step 1:
Plug-in your Flash Drive . First plug-in your USB stick to your USB port and copy all the content to a safe location in your hard drive .

step 2:
Run Command Prompt as an administrator . For opening Command prompt

• Go to start menu and type cmd in the search box . Right click on it and select run as Administrator to use it with admin-rights .

step 3:

Using the Diskpart utility find the drive number of your Flash Drive . To do so, type in the following commands in the Command Prompt :

• DISKPART

Running DISKPART will display the version of DISKPART you are running, name of your PC . Run the following command 

• list disk

Your Disk Number will be listed and note it down as you'll need this in the next step .
Let us assume that the USB Drive is Disk 1 but if it was listed as Disk 2 use Disk 2 instead .

step 4:

Format the drive by executing the following commands one by one . Make sure you replace Disk 1 with proper Disk number .

• select disk 1
• clean
• create partition primary
• select partition 1
• active
• format fs=NTFS
• assign
• exit

When its done and if everything goes well , you should have a formatted USB drive .

step 5:

Make the Flash Drive bootable by using the bootsect utility that is shipped with Windows 7/Vista .For doing so

First insert the Windows 7/Vista DVD and note down the drive letter of the DVD drive . Let us assume it as D: and that of the USB as G .

Navigate to the directory where bootsect is found .

D:
cd d:\boot


Use the bootsect to make the USB Drive Bootable (ie Updating the drive with BOOTMGR compatible code) and for preparing it to boot Windows 7/Vista . Here, replace G: with the name of your USB Drive .


BOOTSECT.EXE/NT60 G:


Close the Command Prompt windows .

step 6:

Copy all files from the Windows 7/DVD DVD to the formatted USB stick . The safest and the fastest way would be to use the Windows Explorer.

step 7:

Change the boot priority at the BIOS to USB.