Acrobat DC will no longer combine Word Files into a single PDF

I'm running the latest versions of Word, Acrobat DC, and Windows 10 is up to date.

This has been going on for a few weeks now.  I have Creative Cloud.  On my Notebook Computer if I add files to combine, the Word thumbs show little priviews of the odcus before combining and, after I click Combine, they combine into a single PDF file.

On my desktop, however, when I add the same files, they remain as icons below (as if the Word covnerter is broken)

When I click Combine, Acrobat launches Word, Opens the first document, launches the Save as PDF Print Driver, and prompts me to save the first Word Dcoument as PDF.

Combine fails as below.  I have tried re-installing Office 365.  I have tried uninstalling and reinstalling Adobe Acrobat DC.  Combine files is broken and has been broken for a few weeks now after working for several years.