Microsoft Rushes to Fix Bug That Broke Windows Defender Scans
Microsoft has rushed to fix a bug that prevented users from running a quick scan or a full system scan with Windows Defender.
Many users reported this week that after they installed the latest update for Windows Defender the security application would only scan a small number of files — reports say between 4 and 64 files.
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Story added 19. September 2019, content source with full text you can find at link above.