Microsoft Security Alert pop-up: Microsoft did not send it
A loud full-screen alert claiming to be a Microsoft security warning, often with a voice saying your computer is infected and a phone number you must call immediately, is a tech support scam page. Microsoft does not put phone numbers in error messages, does not lock browsers, and does not ask anyone to call support from a pop-up. Nothing on that page can see your computer, and closing the browser ends it.
Close it safely
- Call nothing, click nothing on the page. The number reaches the scammers, and the page's buttons can open more pop-ups.
- Close the browser from outside the page. Press
Ctrl+Shift+Esc to open Task Manager, select the browser, and choose End task.
- If the mouse is trapped by full-screen mode, press
Esc first, or Alt+F4, then use Task Manager.
- Reopen the browser without restoring the previous session if it offers to restore pages, decline, so the alert does not come back.
- Run a full scan with Windows Security (Settings, Privacy and security, Windows Security, Virus and threat protection, Scan options, Full scan) to confirm nothing was installed.
The red flags that give it away
- A phone number. Real Microsoft warnings never include one. This alone settles it.
- Urgency and threats. Countdowns, sirens, and claims that your files are being deleted are pressure tactics, real alerts explain and wait.
- It lives in the browser. The alert fills a browser tab or window, often with the normal web address bar hidden by full-screen mode.
- It knows your IP address or city. Every website can see an IP address, and the page prints it back to feel personal. That is not evidence it knows anything else.
- Payment or remote access is the goal. Anyone who answers the number will ask for remote access software and then a credit card or gift cards.
Already called or let someone connect? Hang up and disconnect the session at once. If remote access software was installed, uninstall it and restart the computer. Change the passwords for email and banking from a clean device, turn on two-factor authentication, and call your bank if any payment details were shared. Report the number and what happened at reportfraud.ftc.gov. A full scan with Windows Security, plus a Microsoft Defender Offline scan, is a sensible clean-bill check.
Common questions
Will Microsoft ever warn me about a virus with a pop-up? Windows Security can show real notifications inside its own app and in the Windows notification area, with no phone number and no demand to call anyone. A browser page claiming to be Microsoft and asking you to call is a scam every time.
Did the pop-up infect my computer just by appearing? A pop-up by itself is usually just a web page. Real harm starts if a program was downloaded and run, or if someone was given remote access. A full Windows Security scan after closing it is the right check.
Related