The "your computer is infected" pop-up is the scam
A scary pop-up that tells you to call a number is a tech-support scam — the warning itself is the trap. Here’s how it works, the tells, and the free move that defeats it.
A tech-support scam starts with a scare. A pop-up fills your screen — sometimes with alarms, a frozen page, or a “Microsoft/Apple security” banner — warning that your computer is infected, hacked, or about to lose your files. It urges you to call a number “now” for help. The warning isn’t real. Calling that number is the scam.
How the scam works
- The fake warning. A pop-up dressed up to look like a known tech company claims your device is compromised and tells you to call support immediately.
- The hook. The pressure is the point — urgency stops you checking whether the warning is real.
- The access. On the call, a “technician” asks to connect to your computer remotely, then “finds” problems and offers a paid fix.
- The drain. They charge for fake repairs, install real malware, or — in the most damaging version — talk you into moving money “to protect it,” steering you toward your own bank.
The fact that cuts through it: a genuine security alert never asks you to phone a number, and real companies don’t cold-call, email, or text you about a problem on your computer.
How to spot it
The tells are in the box below. The one-line rule: if a warning tells you to call a number, it’s a scam. Real software fixes or flags issues inside the program — it doesn’t route you to a phone line.
What to do instead
You don’t need to buy anything to beat this — the free move comes first (see the defense box). The habit is Go Direct: don’t call the pop-up’s number; close it, and if you’re worried, run your own security scan or ask someone you trust. For the products that genuinely help against malware, see our honest tools page, where the free steps always come first. If a “technician” then tells you to move money to “protect” it, that is the phantom hacker scam. For more, see our defense moves or test your eye on the 60-second quiz.
- A pop-up or message warns your computer is infected or compromised and tells you to call a phone number.
- It looks like it’s from a well-known tech company and pushes urgency — your files or accounts are "at risk right now".
- On the call, they ask to connect to your device remotely, or to pay for a "fix" — sometimes steering you toward your bank.
- Don’t call the number in a pop-up and don’t click its links. A real security warning never tells you to phone a number.
- Close the pop-up, or restart your device. Legitimate companies don’t cold-contact you about a computer problem by phone, email, or text.
- If you’re worried, update your security software and run a scan yourself — or take the device to someone you actually know and trust.
- Never grant remote access or pay by gift card, wire, or crypto to an unsolicited "technician".
This scam hijacks your sense of responsibility: you think you’re being safe by ‘calling support fast.’ Flip it — the pop-up telling you to call is the attack. The boring, correct move is to close it, and if you’re genuinely unsure, ask someone you trust in person rather than a number on a screen.
Sources
Frequently asked
How do I know the pop-up is fake and not a real virus warning?
The giveaway is the phone number. Real security software shows alerts inside the program and never asks you to call a number for help. If a "warning" wants you to phone someone, it’s a scam.
I already let them connect to my computer. What should I do?
Disconnect from the internet and run a security scan. Change your important passwords from a different, trusted device. If you paid or shared bank details, contact your bank and consider a credit freeze.
They said they were from a company I recognize. Could it be real?
Scammers impersonate well-known companies to seem credible. A familiar name in a pop-up proves nothing — reach the company yourself through its official site or app, never the pop-up’s number.