

On this same screen, you can expand “Microsoft Defender Antivirus options” and enable “Periodic scanning.” Defender will then perform regular background scans even while you’re using another antivirus program, providing a second opinion and potentially catching things your main antivirus might miss. However, there is a way to use both your antivirus program of choice and Microsoft Defender. RELATED: How to Periodically Scan Your Computer With Windows Defender While Using Another Antivirus The process may run in the background, but it shouldn’t use CPU or disk resources attempting to scan your system. This means that Windows Defender is disabled. If you head to Windows Security > Virus & threat protection, you’ll see a message saying “You’re using other antivirus providers” if you have another antivirus program installed and activated.

If you do have another antivirus program installed (like Avira or BitDefender), Microsoft Defender will automatically disable itself and get out of your way.
