No doubt that files can be transferred via pen drives but what if the need arises to reinstall the Operating System in case of a system crash or if the requirement is to install the new Windows 7? What then? How would it be if you upgrade or re-install your Windows OS via a flash drive? There are a number of ways in which you can load or install Windows XP, Vista or Windows 7 from the USB Pen Drive. We are going to show you the easiest way to create your own bootable pen drive.