[Greyman]

tie
Еще можно это:
1.Magical Jelly Bean Keyfinder

The Magical Jelly Bean Keyfinder is a freeware utility that retrieves your Product Key (cd key) used to install windows from your registry. It has the options to copy the key to clipboard, save it to a text file, or print it for safekeeping. It works on Windows 95, 98, ME, NT4, 2000, XP, Server 2003, Office 97, and Office XP.

2. CD Key Reader

Occasionally, you may wish to know what CD key was used to install an application. Provided this data is stored somewhere, it can be retrieved. This utility is designed to find and display this data. Currently, only keys for modern Microsoft applications can be retrieved but this may be extended in the future. This is a small utility. It does not include install and uninstall methods or online help, etc. Simply download and run it. To uninstall, just delete it.