Easy way to create USB bootable disk for Windows Vista or 7 without using any software

If you haven't been able to create a USB boot-able disk before then this method is helpful for you. It is literally 100% working, other thing remaining constant. It is simple guides to creating a boot-able USB drive for a Vista or Windows 7 installation. This will walk through the steps to create a boot-able USB flash drive for the purpose of installing a Vista or Windows 7 OS. These instructions has to be done in Windows Vista or Windows7 installed in yours PC.

Resource and Hardware Required
1. USB Flash Drive (Minimum 4GB or More)
2. Microsoft OS DVD either Vista or Windows 7
3. A computer running either Vista or Windows 7

Step 1: Format the Drive
The steps here are to use the command line to format the disk properly using the diskpart utility. [It will erase everything on your drive. Back up yours USB first.]

1. Plug in your USB Flash Drive

2. Open a command prompt as administrator (Right click on Start > All Programs > Accessories > Command Prompt and select “Run as administrator”

3. Find the drive number of your USB Drive by typing the following into the Command Prompt window:
diskpart
list disk
The number of your USB drive will listed. You’ll need this for the next step. I’ll assume that the USB flash drive is disk 1.

4. Format the drive by typing the next instructions into the same window. Replace the number “1” with the number of your disk below.

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

DO NOT close the command window.
When that is done you’ll have a formatted USB flash drive ready to be made bootable.

Step 2: Make the Drive Bootable
Next we’ll use the bootsect utility that comes on the Vista or Windows 7 disk to make the flash drive bootable. In the same command window that you were using in Step 1:

1. Insert your Windows Vista or Windows 7 DVD into your DVD drive. 
2. Change directory to the DVD’s boot directory where bootsect lives. Just type the Disk directory followed by ":", "f" is in my case

f:

cd f:\boot

3. Use bootsect to set the USB as a bootable NTFS drive prepared for a Vista or windows 7 image. I’m assuming that your USB flash drive has been labeled disk
  G:\
 bootsect /nt60 g:
4. You can now close the command prompt window, we’re done here.

Step 3: Copy the installation DVD to the USB drive
Copy all of the files on your DVD on to the formatted flash drive (USB Drive). After you’ve copied all of the files the disk is ready to boot.

Step 4: Set your BIOS to boot from USB
If you wish to boot your computer then. Insert the USB, restart your computer. Inter into BIOS. The process is different for different system. Most important, set your first boot device to USB.