When trying to register Finale 2006 on this site, I get a message in a red box that says "The Serial Number is not valid for this customer." I then remembered maybe I had another login with a different email address from years ago. I logged in to my old account, and the software was not registered there either. I tried to register again and got the same message. I bought this software new and no one else has used it or my serial number. How do I fix this and register when MakeMusic offers the worst customer support ever????