Microsoft Word not responding usually appears as an error message or as a complete freeze of the graphical user interface. While the cause may not be immediately apparent, there are a number of things you can do to fix it and get Word running smoothly again.
[Solution] How to Fix Microsoft Word Not Responding, Not Starting or Not Opening on Windows 10
You usually get the "Microsoft Word is not responding" message for one of the following reasons:
Sometimes the answer is as simple as restarting your computer. If a restart doesn’t fix the problem, disabling add-ons and repairing the program are the best options.
Start Word in Safe Mode. By loading the application without templates and add-ins, you can see if the program is working as it should or if it is corrupted.