How do you know if a virus warning is real?

3 Most Common Fake Virus Warnings

1. Website Advertisements Disguised as Virus Scanners. …
2. Browser Popups Claiming to Be Virus Scanners. …
3. System Tray Notifications Pretending to Be Operating System Warnings. …
4. Don’t Click the Fake Alert. …
5. Make Sure It’s a Fake Warning. …
6. Search for the Antivirus Product’s Name.