WARNING: Your computer has been locked and infected with a virus. Do not shut down or restart. Call Microsoft Support immediately on 1-800-555-0100 to avoid data loss.
How it works
- A full-screen pop-up with sirens, a countdown or a “locked” screen appears in your browser. Or someone calls claiming to be from a well-known tech company.
- You’re told to call a number, or to let a “technician” help.
- The “technician” asks you to install remote-access software, then “shows” you fake errors.
- They charge you for an unnecessary fix, move money between your accounts to “refund” you too much, or steal your banking logins.
A variation is a surprise invoice for a subscription you never bought, with a number to call and cancel.
The tells
- Real operating systems and browsers never show a phone number in a warning.
- Anyone who contacts you first about a problem with your computer.
- A request to install AnyDesk, TeamViewer or similar.
- Payment by gift card, crypto or wire transfer.
What to do
- Close the browser (force-quit it, or restart the device). Don’t call the number.
- If you let someone connect: disconnect from the internet, uninstall the remote-access tool, and change your passwords from a different device.
- If you paid, or shared banking details: contact your bank at once.
- For a surprise invoice: check your real statements. If there’s no such charge, there’s nothing to cancel.
Where to report it
Anywhere in the world
- Your bank or card provider. First, if money or card details are involved. Use the number on your card.
- The platform where it happened. Use its “Report” button: the marketplace, the messaging app, the social network.
- Your local police. If you’ve lost money, and for a reference number your bank may ask for.
- Your national fraud or consumer-protection agency. Search for it by country; use a government address (.gov or the equivalent).
United States
- Report to the FTC — The Federal Trade Commission’s fraud reporting site.
- Report internet-enabled crime to the FBI (IC3) — File even if you’re unsure it qualifies. IC3 will never contact you to ask for money.
- Forward scam texts to 7726 (SPAM) — Free with most carriers.
Links last checked 2026-10-12.
United Kingdom
- Forward suspicious emails to report@phishing.gov.uk — Handled by the National Cyber Security Centre.
- Forward suspicious texts to 7726 — Free. Your mobile provider receives the report.
- Report Fraud (England and Wales) — If you’ve lost money or been hacked. Phone 0300 123 2040.
Links last checked 2026-10-12.
Canada
- Canadian Anti-Fraud Centre — Use its “Report fraud” page.
- Forward scam texts to 7726 — Free with most carriers.
Links last checked 2026-10-12.
Australia
- Scamwatch — Run by the national consumer regulator.
Links last checked 2026-10-12.