ProduKey will allow you to easily retrieve or recover the product key, CD Key or Serial of your Microsoft Office or Windows products. Recover lost Microsoft Windows or Microsoft Office product keys. ProduKey is both tiny and easy to use, making it a must have tool to add to your portable USB collection. The interface works much like IEPassView.
ProduKey Windows CD Key recovery tool Screenshot:
Authors Website: nirsoft.net/utils/product_cd_key_viewer.html
Download: Download it directly from HERE