SterJo Key Finder is a tiny tool which will quickly locate and display your Windows and Microsoft Office (if installed) product keys.
This can be very useful if you've lost the original keys, perhaps by misplacing the program disc case - if you don't have the key, you may not be able to reinstall your software later.
SterJo Key Finder makes it easy to recover this information, though, so you can manually note your product keys down somewhere. Well, reasonably easy: you have to install it first, which is a minor irritation, it really should be portable.
Once the program is installed, however, there's nothing else to do. Just run it, SterJo Key Finder will find and display your Windows and Office product IDs and keys, and you can make a note of them (or right-click the keys and select Copy to copy the information to the clipboard, ready for pasting elsewhere).