To install the Windows 7 USB/DVD Download tool:
You need to be an administrator on the computer you are installing the Windows 7 USB/DVD Download tool on. The tool requires the Microsoft .NET Framework version 2.0 or higher. If this is not already installed on your computer, the installation program will install it for you. In this case, you may have to reboot your machine to complete installation.
System Requirements
Source and additional info: http://store.microsoft.com/Help/ISO-Tool [4]
Links:
[1] http://pulse.veltsos.com/category/it/software/software/os/microsoft
[2] http://pulse.veltsos.com/category/it/software
[3] http://images2.store.microsoft.com/prod/clustera/framework/w7udt/1.0/en-us/Windows7-USB-DVD-tool.exe
[4] http://store.microsoft.com/Help/ISO-Tool