Suspicious Login Issues

Fix Windows Defender Tech Support Scam Pop-up (+65 3159 2111)

Olivia Miller Oct 7, 2026 868 views

Question details

The user is encountering a technical-support scam pop-up claiming their computer has Trojan spyware and prompting them to call +65 3159 2111.

How to Fix the +65 3159 2111 Windows Defender Tech Support Scam Pop-up

Product: Windows / Web Browser
Device & OS: Windows
Scenario: Browsing the internet and encountering a malicious, fake system alert that locks the browser.
Observed behavior: A fake Windows Defender alert appears on the screen, falsely warning about a malware infection and urging the user to call a fraudulent tech support number.

Before you start

Do not call the provided number, click any links inside the pop-up, or provide personal and financial information. Ensure your computer is not being accessed remotely if you have already interacted with the prompt.

Solution 1Recommended

Force Close the Browser Using Task Manager

Use this method to safely exit the scam pop-up without clicking on any potentially malicious links or deceptive "Close" buttons on the screen.

Tech support scam pop-ups often use JavaScript loops to prevent you from closing the tab normally or use fake "X" buttons that trigger unwanted downloads.

Open Task Manager

Press Ctrl+Alt+Delete on your keyboard simultaneously, then click on 'Task Manager' from the security screen options.

Locate your web browser

In the Task Manager window, navigate to the 'Processes' tab and scroll through the list to find your active web browser (e.g., Google Chrome, Microsoft Edge, or Mozilla Firefox).

End the browser process

Right-click on your browser's name and select 'End task' from the context menu. This will instantly force close the browser and eliminate the scam pop-up.

Force Close the Browser Using Task Manager

Browser Restart Tip: When you reopen your browser, do not click 'Restore pages' if prompted, as this will bring the malicious pop-up back.

Solution 2

Run a Security Scan and Secure Your Accounts

Take proactive steps to ensure no malware was secretly installed and protect your personal information after encountering the scam.

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Frequently Asked Questions

What happens if I call the +65 3159 2111 number?

Calling the number connects you to scammers who will try to trick you into granting them remote access to your computer, paying for fake technical support services, or revealing sensitive personal and financial information.

How did this fake Windows Defender pop-up get on my screen?

These pop-ups are usually triggered by visiting compromised websites, clicking on deceptive advertisements, or by adware (potentially unwanted programs) installed on your browser.

Should I click the 'X' on the pop-up to close it?

No. Scammers often design the 'X' or 'Close' buttons on these pop-ups to trigger full-screen mode, initiate malware downloads, or generate more pop-ups. Always use the Task Manager to force close the browser instead.

Is my computer actually infected with a Trojan spyware?

The pop-up itself is just a scare tactic running in your web browser and does not mean your computer is infected. However, running a full system scan using your legitimate antivirus software is highly recommended to ensure your system is clean.

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