But Word suddenly stopped responding when I tried to save the document. 'I was working on a paper for school last night. Secondly, if you see that the disk usage is 100%, then this means that Word not responding due to RAM overload, and you need to fix it first.Open the task manager (enter 'Task Manager' in the search box or use ctrl + alt + del).If MS Word does not respond, try to shut down the app with Task Manager.