How to Fix Computer Blocked by Fake Microsoft Security Alert
Question details
The user is encountering a loud warning claiming their computer has been blocked by Microsoft or Windows Defender, which prompts them to call a support phone number.
- Product
- Web Browser
- Device & OS
- not provided
- Scenario
- Browsing the internet when a sudden, unclosable warning message appears claiming the computer is blocked.
- Observed behavior
- The screen displays a loud warning claiming to be from Windows Defender or Microsoft, stating the computer is blocked and instructing the user to contact a provided phone number for help.
Do not call the phone number displayed on the screen, do not install any suggested software, and never provide personal passwords or payment information to the scammers.
Force Close the Browser and Run a Security Scan
Bypass the browser-based tech support scam by forcing the application to close and scanning your system for potential threats.
Real Microsoft error messages will never include a phone number for immediate support. This loud warning is a common web browser tech support scam designed to panic you into handing over personal information or money.
Press Alt + F4 on your keyboard simultaneously to force the active web browser window to close.
If the browser refuses to close or the screen remains locked, restart your computer entirely by pressing the physical power button or using Ctrl + Alt + Delete.
Once your computer has restarted, open your antivirus software (such as Windows Security) and run a Full System Scan to ensure no malicious files were downloaded.
Open your web browser settings, navigate to the Extensions or Add-ons menu, and remove any unfamiliar or suspicious extensions.
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- 1. Download the installer: Visit the official WPS Office website and click the Free Download button.
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Frequently Asked Questions
How can I tell if a Microsoft security alert is real or fake?
Genuine Microsoft error messages or Windows Defender alerts will never ask you to call a phone number, nor will they demand payment information for immediate support. If a phone number is displayed, it is a scam.
What should I do if I already called the number on the fake alert?
If you called the number but did not provide information, simply hang up. If you provided payment details or passwords, contact your bank immediately to block transactions and change your passwords from a secure device.
Can this fake alert infect my computer with a virus?
Usually, the alert itself is just a malicious webpage displaying a full-screen image or script. However, if you clicked any links within the pop-up, downloaded software they suggested, or allowed remote access, your computer might be compromised. Always run a full security scan afterward to be safe.
