License Crawler is a very cool freeware program which scans your Windows registry for software license keys and displays them for your further use. No more laborious hunting through the registry with Regedit. Marvellous!
Just fire it up, hit the Start Search key and in seconds it’ll pull up the license and serial numbers of your installed programs, including Windows itself. Note that it won’t find all license keys, just the ones which are installed into the registry, but even that is extremely useful.
If you want to setup your computer system again you need to have the licenses and serial numbers at hand for all the software programs that you have purchased and registered. This does include the Windows product key but also other serial numbers for applications like Nero, Office, VMWare and pretty much every other application. Instead of searching for the keys in your e-mails, manuals and recipes you could use another approach. License Crawler is a sweet little application that scans the Windows Registry for Windows product keys and other serial numbers and licenses.