Windows XP Key Decrypter Tool
This tool allows you to retrieve the product key from a Windows XP installation. It does this by decrypting the DigitalProductID registry entry. This is most useful for damaged installations which you can no longer boot from to run traditional key-recovering applications. This tool works with all versions of Windows XP. For more instructions and information on this tool, please read the related article - Windows XP Product Key Recovery.
Related article: Windows XP Product Key Recovery