That "virus" pop-up is lying to you — here's the 2-minute proof
The screen is flashing. A voice may be talking. There's a phone number and a warning not to turn anything off. Stop. Nothing about that screen has examined your computer — and you can prove it in two minutes.
Proof 1: the phone number (10 seconds)
Microsoft publishes the rule itself: real Microsoft error and warning messages never include a phone number, and Microsoft does not call you, unsolicited, to offer fixes. A warning with a number to call is a sales pitch wearing a warning's clothes. That's not an opinion — it's the manufacturer's own test, and the pop-up fails it.
Proof 2: it's a web page (1 minute)
Press Alt + F4. If the "warning" closes like a browser window — because it is one — you have your answer. Real protection lives in the Windows Security app and stays put; a web page can only shout while it's open. Microsoft's own advice for a screen full of scary pop-ups is the same: close the browser (Alt+F4 if the mouse won't), or restart the computer. Restarting harms nothing, whatever the page claims.
Now, the calm checks
- Don't reopen the page if the browser offers to restore it.
- Open Windows Security → Virus & threat protection → Quick scan. On the overwhelming majority of these occasions it finds nothing — because there was nothing.
- Take back the megaphone: in your browser, Settings → Privacy and security → Site settings → Notifications, and remove sites you don't recognise. That permission is how the page got to dress up. (Explained here.)
- If you have a minute, report it at microsoft.com/reportascam.
Why this works on smart people
Because it arrives as an emergency and emergencies skip the queue. Every element — siren, countdown, "do not shut down" — exists to keep you from doing the one thing that defeats it: pausing. Services know this moment well; it's the moment a US$149.99 "virus removal" gets sold for what is, most of the time, a closed tab and a removed permission. When the same screen comes back — and it comes back to everyone — Geek Doctor will examine what it actually is, remove the permission, and write the whole thing in its notebook so future-you starts from the answer. Free.
Full explanation: the fake "virus" pop-up, explained.