Don’t rely on the fake alert. Use a legitimate antivirus or anti-malware tool (Windows Defender, Malwarebytes, etc.) to run a full system scan. Remove anything it flags.
Stop. Do not click. Do not call that number. how to stop virus pop-ups
These frightening “virus” pop-ups are almost always scams—a tactic called “scareware.” Their goal isn’t to protect you, but to trick you into calling a fake support line, paying for worthless software, or giving remote access to your computer. Don’t rely on the fake alert