My Trial for FLASH CS3 expired, so I bought a bundle for Adobe programs. Now I can't use flash?

A few years back I tried the trial version of Flash CS3. It expired, and I thought nothing of it. 6 months later I bought an Adobe bundle containing Dreamweaver, Illustrator, Flash, Photoshop, Fireworks, Acrobat, and Contribute. Just now I tried opening Flash, and it said that the trial had expired. It gave me the option to renew the program by entering the serial number on the box that I purchased Flash in. I dug up the Bundle Box and entered the number, and Flash said that the serial number is not valid. How can I fix this?