I used the cleaner tool and then re-installed. Thanks for sending the link to the tool.
So here's the giggle: I now no longer get the "Click to Sign" message upon opening every PDF document. Now I get the "Click on Tools to Convert Files to PDF" message on every document I open.
At this point, I guess I'm just supposed to live with it. Thanks, Adobe. Would be nice if you had some actual Customer Support.
I appreciate your time and willingness to help, Michael. Thank you.