Steps to Fix it:

• You can also use the MS Office Application Recovery feature to fix the Microsoft Word not responding error and recover unsaved documents. Open MS Office Application Recovery by going to Start > All Programs> Microsoft Office Tools > MS Office Application Recovery. When you see a list of currently running office apps, choose the document that isn't responding .Select 'Recover Application' from the drop-down menu and restore the document you were working on.
• Microsoft Word should be uninstalled and reinstalled.-Keep your Microsoft Office activation key and keep it to a safe location. Click 'Program and Features' in Control Panel, then find and pick Microsoft Office. In the top menu, select 'Uninstall.' Reinstall Microsoft Office and use your serial key to activate it.

Read More: What are the common issues that you often see while using Microsoft Word?