First, open the Start menu and type “Windows Security.” Click on the “Windows Security” app icon that pops up.
If you haven’t tried Defender before or if your computer is acting funny and you’re worried about an obvious threat, it’s best to start with a Full scan. Select the radio button beside “Full Scan” and click the “Scan Now” button.
A full-system scan will begin, and Windows Security will show a progress indicator bar.
