There appears to be a major bug in Windows Defender, the free antivirus software that comes with the Windows 10.
If you try to run a fast or a full scan after a few seconds the application will stop, scanning a few files. So the results it will display are unreliable. Such scans are known to take a long time to complete.
The issue has been mentioned a lot recently in the forums techniqueof her support Microsoft [1, 2, 3, 4, 5], but also on Reddit [1, 2, 3, 4].
The error appears to be from the version of Windows Defender 4.18.1908.7, released earlier this week. The error occurred when Microsoft attempted to correct another error that occurred with 2019 in July.
According to reports, the initial error "corrupted" the "sfc / scannow" command, which allows Windows users to scan the system for corrupted files.
After the Patch Tuesday of July, this utility began to flag certain internal features of Windows Defender as broken, causing false messages to mislead users. So many people believed that there was a problem with the installation of Windows Defender and its updates.
Microsoft released a bug fix for this bug last week, but apparently did not have the expected results.
This issue does not appear to affect Windows Defender only on Windows 10, but all other versions of Windows that run Windows Defender. The same error has been reported for Security Essentials, the precursor of Windows Defender in earlier versions of Windows.
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