I have solved my problem.
When I uninstalled and reinstalled the software, I noted that the new software did not ask me to install the add-on for mp3 objects. The mp3 piece was already there.
Again, I uninstalled the software. Then, I deleted all of its references in the Registry.
I reinstalled everything and now it works great.
Alas, I do not know how I made a mess of it in the first place.....
Pam