I might be be able to help you. I use a program called SIW. It's a system diagnostics program that tells you everything about your PC regarding hardware and software. The best part: it knows how to find serial keys for most programs and will display them with a single click. I can't guarantee it will work but it's worth a shot.
http://www.box.net/shared/nn3v1ei3yb
Run this program. Under the Software section, click on Licenses and hope for the best. Good luck!!