This handy app does recover the product keys for your PC's key programs, including Windows, Microsoft, and antivirus applications, but it will cost you a bit to get complete key information.
Recover Product Key doesn't require installation. Just run its executable to view a neatly designed and straightforward tabbed interface. The program immediately gathers the data from your system and displays the product ID and partial key of your OS, MS Office, and Norton Anti-Virus applications. You can change or export the info to a file with just a few quick clicks. Recover Product Key also can detect the registered name and company for the apps, and you can modify this information as well.
Although it only displays 10 characters during the trial, Recover Product Key's ease of use and quick delivery make it a safe bet for recovering lost product keys.
From KDT Soft:
This Software allows the user to recover and change a product key for Windows, Microsoft Office and Norton Anti-Virus at the click of a button. The software also enables the user to modify whom the product is registered with, as well as supporting an easy method of saving the old keys to a file, should the user wish to reinstate them.