855-507-5090

I haven't run into one of those fake Microsoft Windows Defender Security Center alerts that freezes the web page you are on in a long time, but it happened to me when I opened a message on Facebook recently.  This telephone number is listed as the one to call to unfreeze your computer.  It is a phishing scam.

Tech Support Pop Up scam:

These are ALWAYS fake warnings!


Web Browsers DO NOT have the ability to determine and warn you your computer has an error. They can only warn you about a potential malicious website you are about to visit. A Browser is software that allows you to surf the Internet, not diagnose a computer or phone. If your computer actually generated an alert, it certainly wouldn't use a web Browser to display it.

Most popups are generated from an Ad on an unsuspecting website and you can just close the tab/window. If it will not close or opens new windows/tabs, you can End Task the Browser {Ctrl+Shift+Esc}.
They can be removed by clearing the Cache and History after restarting the Browser. You should also have an Ad Blocker turned on. If your Browser doesn't have one built-in, you might look to see if it supports a Browser Extension Ad Blocker.
If that didn't work and your still getting pop ups, you might have a PUP (Potentially Unwanted Program) that triggers a popup window.
You can goto https://www.malwarebytes.com/mwb-download/ and get the free trial to remove it or you can try this site to help remove the PUP:
https://malwaretips.com/blogs/remove-tech-support-scam-popups/

Beware of websites claiming "Remove 'this number' pop up virus", as many are downloads for adware cleaners or malware containing scareware. Only trust reputable Malware/Anti-Virus sites that use Official products from the Official website.