Overview
Word, Excel, PowerPoint, Outlook, and other Office applications can sometimes start to misbehave and not function properly. The application may hang or not open altogether. Below are some troubleshooting tips for repairing Office.
Troubleshooting
Microsoft provides a support article for repairing an office application (linked below). If that is not successful, follow the steps to uninstall Office.
Repair an Office application - Microsoft Support