Here is a software(winToFlash) that make it very simple.
The process is simple and mostly obvious. You tell WinToFlash where the installation files you want to transfer are located and either let the transfer wizard take care of things, or specify settings like what kind of format the flash drive will undergo. In our test using a USB 2.0 generic flash drive it took about 12 minutes to turn a Windows 7 installation DVD into a USB-based installer.
Download WinToFlash from here
Download WinToFlash from here
