When closing a Word document, the absence of the prompt to save changes to
the document (as opposed to changes in the underlying template) most often
indicates:
a) Corrupted Word registry entries
b) Corrupted Windows user profile
c) The presence of a virus of some kind. Because a/v programs are so
prevalent, we hardly ever see this as a virus issue anymore.
A large number of Word problems are related to a) and b). The article here,
its name notwithstanding, can help you begin to troubleshoot the issue to
find a resolution: