Is a pop-up saying my computer is infected and to call a number real?
No. Legitimate antivirus software and operating systems never display phone numbers to call. This is a tech-support scam pop-up.
Last reviewed: 1 June 2026
Explanation
Tech-support scam pop-ups are designed to look like Windows or macOS system alerts or antivirus warnings. They typically play an audio warning, fill the screen, and display a phone number. Calling the number connects you to scammers who claim to be Microsoft, Apple, or an antivirus company. They ask for remote access to your computer, show you 'evidence' of infection using normal system tools, then demand payment for a fix or a support contract. Sometimes they install actual malware during the session. Windows and macOS do not display warning pop-ups with phone numbers. Close the browser tab or reboot your computer to dismiss the pop-up.
Common red flags
- Full-screen browser pop-up with a warning message and phone number
- Audio alarm or automated voice claiming your computer is infected
- Pop-up appears while browsing a website, not from your antivirus program
- Caller asks for remote access software like AnyDesk or TeamViewer
What to do now
- Do not call the number — close the browser tab or force-quit the browser
- If the pop-up does not close, restart your computer
- Run a scan with a trusted antivirus tool if you are concerned
- If you gave remote access, disconnect, run a scan, and change all passwords
Frequently asked questions
Can closing the pop-up cause any damage?
Simply seeing or closing a scam pop-up does not damage your computer. The risk only arises if you call the number, give remote access, or download software.