A quick google:
tinyurl.com/d3fgbyk - answers.microsoft.com
"Are you using CCleaner? Piriform has programmed it for some reason to remove part of the MSE History files and it's deleting the files MSE checks to determine the last time a scan was conducted.
Open CCleaner Applications Tab, Under Windows uncheck MS Antimalware...that should prevent CCleaner from deleting the MS Antimalware scanning history files."
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