Fake virus popups in Chrome: how to close them and stop them for good

You're browsing normally when suddenly a window takes over the screen: a loud alarm, a flashing red warning, and a message saying your computer is infected, your files are at risk, or "Windows Defender" has detected a virus. Sometimes there's a phone number to call. Sometimes a button to "clean your PC now."

Take a breath. These warnings are fake. A website cannot scan your computer, and Microsoft, Google and genuine antivirus companies do not show warnings like this inside a web page. The popup is designed to frighten you into calling scammers, paying for useless software or letting someone take control of your PC.

In most cases, closing the tab ends the problem completely. This guide shows you how to close it safely, how to stop similar popups from appearing, and how to check your PC if you're worried.

1. How to tell a fake warning from a real one

Real security alerts in Windows 11 come from the Windows Security app or your installed antivirus program. They appear as a small notification in the corner of the screen, outside your browser, and never include a phone number.

A fake warning usually has several of these signs:

• It appears inside the browser window, often in full screen.
• It plays a siren, beeping or a recorded voice.
• It shows a phone number and tells you to call "Microsoft Support" or "Windows Support".
• It claims your computer is "locked", "blocked" or that your "IP address is compromised".
• It shows an animated "scan" with a list of viruses found within seconds.
• It uses countdown timers and urgent phrases like "do not restart your computer".

Another common version is a small notification in the bottom-right corner that looks like an antivirus alert but actually comes from a website you once allowed to send notifications. Section 3 removes those.

2. Close the popup safely

Don't click anything inside the warning — not even buttons that say "Cancel" or "Close", because those may be part of the fake page.

Try this first

1. Press Esc a couple of times to leave full-screen mode.
2. Close the tab with the X on the tab itself, or press Ctrl + W.

If the browser seems locked

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Find Google Chrome in the list, select it, and choose End task.

Stop Chrome reopening the same page

When you open Chrome again, it may offer to Restore your pages. Don't select it. If the fake page returns anyway:

1. Disconnect from the internet (turn off Wi-Fi from the taskbar) before opening Chrome.
2. Open Chrome, close the scam tab, and then go to Settings > On start-up and choose Open the New Tab page.
3. Reconnect to the internet.

3. Remove notification spam

Many "virus alert" notifications come from websites that tricked you into clicking Allow — often with a message like "Click Allow to confirm you're not a robot." Once allowed, they can send fake alerts even when the site isn't open.

1. In Chrome, open the menu (⋮) and choose Settings.
2. Go to Privacy and security > Site settings > Notifications. You can also paste chrome://settings/content/notifications into the address bar.
3. Under Allowed to send notifications, look for any site you don't recognise or trust.
4. Select the ⋮ next to each one and choose Remove or Block.

If you rarely use website notifications, choose Don't allow sites to send notifications at the top of that page. You can still allow trusted sites individually later.

4. Remove unwanted extensions

Some popups come from browser extensions that were installed alongside free software or from a misleading ad.

1. Paste chrome://extensions into the address bar and press Enter.
2. Look through the list. Remove anything you don't remember installing, don't use, or that has a vague name like "Search Helper", "PDF Converter Pro" or "Weather Now".
3. Select Remove under each unwanted extension.

If an extension says it's "Installed by your organisation" on a home PC and you can't remove it, that's a sign of unwanted software — run the scan in section 6.

5. Reset Chrome settings

If popups, new tabs or a changed search engine keep appearing, a reset returns Chrome to its default state without touching your bookmarks, history or saved passwords.

1. Paste chrome://settings/reset into the address bar.
2. Select Reset settings to their original defaults, then Reset settings.

This resets your start-up page, new tab page, search engine and pinned tabs, and disables all extensions and clears temporary data such as cookies. You'll need to sign in to some websites again.

6. Scan your PC with Microsoft Defender

If you only saw a popup and closed it, your PC is very likely fine. But if you clicked download links, installed something, or the popups keep returning after the steps above, run a scan.

1. Open Windows Security from the Start menu.
2. Select Virus & threat protection > Scan options.
3. Choose Full scan and select Scan now.

For stubborn problems, choose Microsoft Defender Offline scan from the same list. Your PC restarts and scans before Windows loads, which catches software that hides while Windows is running. Save your work first; the scan takes about 15 minutes.

Also check Settings > Apps > Installed apps and uninstall any program installed around the time the problems started that you don't recognise.

7. Prevent it happening again

• Turn on Enhanced protection: In Chrome, go to Settings > Privacy and security > Security and choose Enhanced protection. Chrome will warn you about more dangerous sites and downloads.
• Keep Chrome updated: Go to Settings > About Chrome. Chrome checks for updates automatically; select Relaunch if one is waiting.
• Be wary of "Allow" prompts on sites you don't know, especially ones that say you must allow notifications to continue.
• Download software from the official source, and during installation choose "Custom" to untick extra offers.
• Consider an extra layer of browsing protection if you or a family member clicks links often. We compare some options in our lesser-known antivirus comparison.

8. If you already called or clicked

Scammers are convincing, and many careful people get caught. Act quickly and calmly:

• If you let someone connect to your PC: disconnect from the internet immediately. Uninstall any remote-access program they asked you to install (check Installed apps for recently added programs). Then run a Microsoft Defender Offline scan.
• If you paid or gave card or bank details: contact your bank or card provider straight away using the number on the back of your card, and explain that it was a tech support scam.
• If you gave out any passwords: change them from a different, trusted device, starting with your email account. Turn on two-step verification where possible.
• Report it: in India, you can report cyber fraud at the national cybercrime portal (cybercrime.gov.in) or by calling the 1930 helpline. In other countries, use your national fraud-reporting service.
• Expect follow-up calls: scammers sometimes call back pretending to offer a "refund". Hang up.

Frequently asked questions