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How to Fix the Fake Microsoft Defender Tech Support Scam Popup

Tauseeq Magsi Oct 22, 2026 869 views

Question details

The user is experiencing a fraudulent full-screen browser popup claiming that Microsoft Defender has locked the computer and displaying a toll-free number to call for technical support.

Product: Microsoft Defender
Device & OS: Windows
Scenario: Browsing the internet when a sudden, intrusive warning message freezes the screen.
Observed behavior: A browser popup locks the screen, falsely claims the PC is infected or blocked by Microsoft Defender, and demands the user call an 800 number to resolve the issue.

Before you start

Do not panic, do not click any links on the warning screen, and absolutely do not call the toll-free number provided. Genuine Microsoft error messages never include phone numbers to call for technical support.

Solution 1Recommended

Force Close the Browser via Task Manager

The most effective way to dismiss a locked scam popup without interacting with any malicious scripts on the webpage.

Tech support scam websites use clever coding tricks to lock your browser in full-screen mode, making it seem like your entire computer is frozen. You can bypass this by forcing the application to shut down.

Try a keyboard shortcut

Press the Alt + F4 keys simultaneously on your keyboard to attempt closing the active browser window immediately.

Open Task Manager

If the window does not close, press Ctrl + Alt + Delete and select 'Task Manager' from the security screen.

Locate your browser

Under the 'Processes' tab in Task Manager, scroll down to find the web browser you are currently using (such as Google Chrome, Microsoft Edge, or Firefox).

End the task

Right-click on the browser process and select 'End task' from the context menu to force the application to close completely.

Force Close the Browser via Task Manager

Important: When you reopen your browser, you may see a prompt asking to 'Restore previous session' or 'Restore pages'. Do not click it, as doing so will reopen the scam webpage.

Solution 2

Report the Tech Support Scam to Microsoft

Report the fraudulent popup to help Microsoft track down and block the scammers.

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Frequently Asked Questions

Can a scam website actually lock my computer system?

No, a webpage cannot lock your operating system. Scammers use full-screen modes and repetitive dialogue boxes to make your browser unresponsive, creating the illusion of a locked PC. Force-closing the browser via Task Manager resolves this.

What should I do if I accidentally called the fake Microsoft support number?

If you called the number, hang up immediately. If you provided remote access to your device, disconnect from the internet, uninstall any remote access tools they had you download, run a full antivirus scan, and contact your bank if you shared any payment information.

How can I prevent these fake Defender popups from appearing in the future?

To minimize the risk of encountering these popups, ensure your web browser and Windows OS are up to date, install a reputable ad-blocking extension, avoid clicking on suspicious links in emails, and keep Windows Security's real-time protection turned on to block known malicious websites.

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