Short answer
A warning with a phone number is a scam, every time. Real security software never asks you to call. Close the browser, do not call, and if you already gave someone remote access, treat your accounts as the emergency rather than the computer.
How to tell it is fake
- It displays a phone number and urges you to call immediately.
- It appears inside a browser window, often full screen, sometimes with alarm sounds or a locked-looking page.
- It uses a well-known brand name — Microsoft, McAfee, Norton, Windows Defender — combined with a countdown or a threat.
- It claims to know specific things about you, such as banking details or photos, to create panic.
Genuine antivirus alerts appear in the notification area of the operating system, name the file they found, and never ask you to phone anyone.
What to do right now
- 1
Do not call the number
The number belongs to the scammer. Calling is the whole point of the page.
- 2
Close the browser window
Press Alt+F4, or use Task Manager (Ctrl+Shift+Esc) to end the browser task. On a Mac, use Force Quit from the Apple menu.
- 3
Reopen the browser carefully
If it offers to restore the previous session, decline — restoring puts the same page straight back on screen.
- 4
Check what is actually installed
Look through installed programs and browser extensions for anything you don't recognise, especially anything added on the day the popup started.
If you already called or allowed remote access
Remote sessions also frequently leave behind legitimate remote-access software configured for unattended entry. It looks harmless in a program list, which is exactly why it needs someone to look for it specifically.
What a clean scan does and does not prove
When to bring it in
Bring it in if remote access was given, if popups keep returning, if the browser opens pages you didn't ask for, or if you simply want certainty. A proper cleanup checks installed software, scheduled tasks, browser configuration and remote-access tooling — then verifies the machine behaves normally afterwards.
Common questions
- Should I just reset the computer to be safe?
- Not before your files are backed up and your accounts are secured. A reset wipes personal data and does nothing about passwords the scammer may already have.
- Can they still get back in after I close the popup?
- Only if software was installed or credentials were captured. That is exactly what a cleanup is checking for.
The service that covers this
Virus, Spyware & Adware Removal
Infections cleaned out properly — registry, temp files, browsers, and hidden leftovers.
Virus, Spyware & Adware Removal in Bellevue →Optional next step
After we clean it up, keep it protected.
Ask us about Home-IT for ongoing protection, monitoring and remote support — an optional extra layer of help when something looks wrong.
Learn About Home-IT →Related guides
- What To Do After a Fake Microsoft Support ScamYou called the number or let someone connect. Here is the order to do things in: cut access, secure accounts from a clean device, contact your bank, then have the computer checked.
- What To Do If Someone Remotely Accessed Your ComputerWhether it was a scam caller, a stranger or an ex-partner, remote access needs the same response: cut the connection, secure accounts, and check what was left behind.
- Computer Running Slow: What Actually Fixes ItSlow computers usually come down to a mechanical hard drive, a full drive, not enough memory, or background software. Here is how to tell which one you have.