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 can check whether Defender is active for you via Windows icon > All apps > Windows security > Virus and threat protection and then under “Who is protecting me” on the right-hand side. Look for “Microsoft Defender Antivirus.” The Defender has a virus guard that constantly analyzes every new file. It also regularly scans all files on your system. The tool tries to start this scan only when you are …