WinToFlash is an application that allows you to transfer Windows XP, Windows Vista, Windows 7, and also Server 2003 and 2008 from the CD / DVD to a USB / Flash Drive. Also easy to use, to create a USB Bootable you can just follow the “Windows Setup Wizard transfers”
WinToFlash is a free and portable software which simplifies creating a bootable USB flash drive for Windows operating system. You can use this to make backups of your Bootable CD / DVD or Live CDs and can be very much helpful as you can carry your OS on a USB pen drive or thumb drive. This is available for download in many languages.
Win To Flash though is Freeware but in constant development by the developer. The latest version is currently in Beta and is also a portable application. In our tests using USB 2.0 it took about 12 minutes to change the installation DVD of Windows 7 to be a USB-based installer.
Download : http://wintoflash.com/download/en/