I had bought a key to use the QT Pro features from Quictime 4 through apple.com, which costs $30. Since then, when it was placed on my iMac, the software started working worse so I reloaded the system software and even did write down the code for my key so I could use it again. Once I reloaded the software on that computer (now I am on a newer one), and still even now, it will not accept the key it had given me with the online purchase and it still says the key with my name is invalid. Is there any way to contact Apple so they can find me on their files to fix this without having buy another copy for another $30?

For QT Pro registrations, the "Registered To:" box *and* the Registration Number have to both be the "official" ones you got from Apple. Just reentering the Number won't work if it doesn't match the Registered name.

you can get a refund if you are dissatisfied with it by e-mailing thema proof that you got rid of it. i think the refund form can be downloaded from apples site.