Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Christopher,
Have you tried to repair Office 2013 installation?
If not then try to repair Office 2013 installation and check if that resolves the issue.
Refer to the article given below on how to repair Office 2013:
http://support.microsoft.com/kb/2827031/en-us
If the repair of Office does not help then follow the steps provided under the section ‘Is your problem solved?’ in the above link.
Let us know the results to assist you further.
Thank you.