Boot your PC with Flash Drive

Creating Bootable Vista / Windows 7 USB Flash Drive

It would work for Windows Vista and Windows 7

You need

1.USB Flash Drive (4GB+)

2.Microsoft OS Disk (Vista / Windows 7)

3.A computer running Vista / 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. You can format your disc by right clicking your USB Drive icon also.Don't do quick format.

Plug in your USB Flash Drive
Open a command prompt as administrator (Right click on Start > All Programs > Accessories > Command Prompt and select “Run as administrator”.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.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

When that is done you’ll have a formatted USB flash drive ready to be made bootable.

Step 2: Make the Drive Bootable
In the same command window that you were using in Step 1:

Insert your Windows Vista / 7 DVD into your drive.

Change directory to the DVD’s boot directory where bootsect lives:

d:
cd d:\boot

Use bootsect to set the USB as a bootable NTFS drive prepared for a Vista/7 image. I’m assuming that your USB flash drive has been labeled disk G:\ by the computer:

bootsect /nt60 g:

You can close the command window now

Step 3: Copy the installation DVD to the USB drive
Copy all the files from your DVD to flash drive. After you’ve copied all of the files the disk you are ready to go.

Step 4: Set your BIOS to boot from USB

Different computer have different option for this.But usually pressing F2 or F8 during start-up will give you Bios option.