TO ANYONE RECEIVING THE "TRIAL PERIOD HAS EXPIRED" ERROR
Do as mentioned above and first uninstall the program. Remove any existing folders or registry keys that are associated with the program.
This next part is extremely important. None of the above ever worked for me but this did the trick. It appears that when you do get this error for the first time, AnyDVD creates a file in your Windows profile so if you try to reinstall the program and then run it you will still receive the error.
First, make sure in your Folder Options in Windows you have Hidden files set to View, and also show Hidden Operating System Files.
Next, navigate to C:\Documents and Settings*YourUserName*\Application Data and delete the Slysoft folder!
Next, install the latest copy of AnyDVD and when the setup finishes, register it with your registration key. Reboot like normal and the program should run as long as you did everything as mentioned above.