Www.webroot.com/secure– Windows Security, popularly known as Windows Defender, is the default Antivirus and Security solution available in Windows 11. It’s among the most effective solutions available and in most cases it is effective. But it is not without its flaws. One of the most frequently reported issues observed is that following an upgrade or any other time, Windows Security doesn’t open and function as expected. If a user attempts to open the application but it doesn’t work. This article will discuss various options that will help you resolve the issue.