Well maybe you would like to be more specific, such as what exactly is the
text of the notice? There are Windows Defender specific discussion groups
which is the best place for posting a WD question, and please give complete
info on the problem.
If all fail try to run the Run command: sfc /scannow and let it run.
Do you get an Error Message, try to look in the event viewer for any error
messages (X) reported in the Error log.
HTH.
Regards,
nass
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