For those who use Windows 8.1 or later versions, the application simply runs in the background and protects against various threats.
Simply, it is a built-in anti-malware program that has been developed by Microsoft Inc. Windows Defender, or Windows Defender Antivirus, is the most popular antivirus system used by Windows users all over the world. What is Windows Defender and why do you need it? To allow this app to run, contact your security administrator to enable the program via group policy. In this case, users receive the following error message when trying to open Windows Defender.
In addition, it is possible that Windows Defender gets automatically turned off after installing a third-party antivirus and security software. If you keep receiving a message This app is turned off by group policy when you are trying to access Windows Defender security application, you might be dealing with malware or virus.
