How would they be able to find trnorth1 in their database, if you called yourself firstname.lastname@example.org then? In fact, if they could, anybody reading your post could contact them and get a free key (well, only the first caller).
If you didn't save the mail they sent you the note and password with, it's hopeless.
On the positive side: we recommend NOT using registry cleaners and optimizers AT ALL. Nothing is lost if you don't use the program, except the money you paid back then. However, consider that as being thrown away already in 2008.
I purchase the Adv Reg Optimizer in 2008, I have a receipt with a download this file note and a password. That's it. I am not even sure what e-mail I used back then. If there any way to find my key so I can use the full version of the program?