Hello Robert H,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well?
Have you tried repairing Office online? If you haven't, use steps and link below for guidance:
- Right-click the Start button (lower-left corner), and select Apps and Features on the pop-up menu.
- Select the Microsoft Office product you want to repair, and select Modify.
- In the window How would you like to repair your Office Programs, select Online Repair > Repair to make sure everything gets fixed.
- Follow the instructions on the screen to complete the repair.
https://support.microsoft.com/article/7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b
Please let me know if you need any more assistance.
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Warm Regards