Computer "virus warning" that wants remote access
A popup or call says your computer is infected and asks to connect to it remotely.
How this scam works
Your screen fills with a warning, sometimes with an alarm sound, saying your computer is infected and you must ring a support number immediately. Or the phone rings and someone says they are from Microsoft, BT or your broadband provider and have detected a problem.
They ask you to install a program so they can "fix" it. That program, usually AnyDesk or TeamViewer, hands them full control of your computer. From there they open your online banking, move money, and use a trick to make the screen show a fake balance so you do not notice.
Some versions "accidentally refund you too much" and then ask you to send the difference back. The refund was never real.
Microsoft does not ring people about viruses. Neither does BT, Sky or Virgin Media.
Warning signs
- A full-screen warning with a phone number and an alarm sound
- Anyone asking you to install AnyDesk, TeamViewer or "remote support"
- They ask you to log in to your bank while they watch
- They say they have refunded you too much and need some back
What to do
- Do not ring the number on the warning. It is part of the scam.
- Close the browser. If it will not close, hold the power button until the computer shuts down, then restart.
- Never let anyone who rang you connect to your computer.
If it has already happened to you
This happens to sensible, careful people every day. What matters now is acting quickly.
- Disconnect the computer from the internet straight away.
- Ring your bank on 159 from a different phone.
- Ask someone you trust, or a local repair shop, to remove the remote access software.
- Change your online banking and email passwords from a different device.
- Report it to Action Fraud on 0300 123 2040 or at actionfraud.police.uk.
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Check a messageLast updated 29 September 2026. Source: NCSC.