How to use Microsoft Defender, the antivirus security program on Windows 10

Formerly known as Windows Defender, Microsoft Defender is an antivirus protection program that's included with Windows 10.
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Why are your Windows Defender antivirus scans slow? Here’s how to find out

Here are the basics: Microsoft Defender is the virus protection integrated into Windows by default. If no other antivirus program is installed and activated, Defender protects you against viruses. You ...