Suspicious Login Issues

Is 1-855-574-3809 a Legitimate Microsoft Support Number? How to Handle Tech Scams

Phi Hung Vo Oct 7, 2026 870 views

Question details

The user encountered a sudden security pop-up on their computer instructing them to call 1-855-574-3809 to resolve a locked computer or security threat.

Is 1-855-574-3809 a Legitimate Microsoft Support Number?

Product: Windows / Web Browser
Device & OS: not provided
Scenario: Browsing the internet when a sudden, unclosable alert takes over the screen claiming the system is compromised.
Observed behavior: A fake security pop-up locks the web browser, falsely claiming the computer is infected and prompting the user to call a scam support number.

Before you start

Do not call the number, provide any personal information, or grant remote access to your computer. Temporarily disconnect your device from the internet to prevent unauthorized access while you clear the scam message.

Solution 1Recommended

Force Close the Scam Pop-Up using Task Manager

Use this method to safely close the frozen or locked browser window without clicking any malicious links on the fake alert.

Tech support scam pop-ups use scripts to lock your browser in full-screen mode, making it seem like your entire computer is frozen. Clicking the 'X' on the pop-up itself can sometimes trigger additional malicious downloads.

Open Task Manager

Press the keyboard shortcut Ctrl + Shift + Esc simultaneously to force open the Windows Task Manager.

Locate your web browser

In the 'Processes' tab, scroll down to find the web browser you are currently using (e.g., Google Chrome, Microsoft Edge, or Firefox).

End the browser task

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

Force Close the Scam Pop-Up using Task Manager

Safe Browsing Recovery: When you reopen your browser, it may ask if you want to 'Restore previous session'. Decline this prompt to avoid reopening the malicious scam page.

Solution 2

Run a Full Security Scan

Ensure no hidden adware or malware was installed in the background that could trigger future pop-ups.

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Frequently Asked Questions

What happens if I already called the 1-855-574-3809 number?

If you called but did not provide personal information or grant remote access, your system is likely safe. If you allowed remote access or paid money, disconnect your internet immediately, contact your bank to halt payments, and run a full antivirus scan.

How did this fake Microsoft pop-up appear on my screen?

These pop-ups usually appear after clicking a deceptive link, visiting a compromised website, or being redirected by adware. It is merely a malicious webpage displaying full-screen, not an actual virus alert from Windows.

Does Microsoft ever send warning pop-ups with phone numbers?

No. Legitimate Microsoft error and warning messages never include a phone number to call. Microsoft support will never proactively reach out to you via pop-ups requesting personal or financial information.

Microsoft Office Security Issues