Here’s what she described: "I received a pop-up that froze my computer and read, ‘Access to this system is blocked for security reasons’ from Windows Defender Security Center. It came with ...

It's very easy to use a Windows computer without knowing what Windows Defender is. The operating system's built-in antivirus program comes free with every modern Windows operating system.

It alerts you via the Windows notification system, and you can also view alerts within the Defender app. Since Windows ...