If the first two disks were recorded and burned properly, there might be a problem with the third one. Try using a different DVD for this operation. If you still can't manage to complete the process, visit the official website. There you can find lots of tutorials, that will help you to properly set up the program. Also, it might be a good idea to perform a fresh installation of the program. You can download the latest version of the program from the site mentioned above.
