Install Windows 7 by USB

If you have Windows7.iso image, you can make your flash drive to format your PC by using special software.

Requirements:

-- higher operating system than XP SP2
-- .Net framework 2.0
-- Microsoft Image Mastering API V2

You can download these option, go to http://download.cnet.com/Windows-7-USB-DVD-Download-Tool/3000-18513_4-10972600.html

You better to format your flash drive by using NTFS format.
After download the software Windows 7 USB/DVD Download Tool --> Open
Select by using browse button -> Path file which includes Windows7.iso image -> Next

Then you can show two options.
--1. .iso image can burn into a DVD
--2. copy to a flash drive

Select copy USB device. -> begin copying

Then the software is configuration the flash drive as a boot able one, it will take several minutes. Then you can use it to format any PC.