Hi,
Did the problem appear in all Word documents?
Where did you save the documents?
I suggest you open a new blank document and go to File- Open and Browse the document, then check if it can open without problem.
I suggest you refer to this support article and try the methods to help you troubleshoot the damaged problem in Word:
https://learn.microsoft.com/en-us/office/troubleshoot/word/damaged-documents-in-word
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