To do this, go to Control Panel > Programs and Features in Windows 7 or navigate to Control Panel > Programs > Uninstall a program in Windows 11/10/8. If that is not working, the best way is to completely remove them. Well then, what to do if you are troubled by Windows Defender not working? How to turn on Windows Defender in Windows 8/10/7 successfully? Take it easy! Get the full solutions from the following part to help you out.įurther tip: If your Windows Defender can work normally, but you have a need to disable it, you can watch the following video. For Windows 7, Windows 8, Windows 10 and Windows 11 users, it is fairly common. To put it simply, this issue is possibly caused by the installation of third-party antivirus software, a corrupted registry, software conflicts, and so on. In addition to the case when Windows Defender could be turned off by group policy, some users said Windows Defender gets an unexpected error and cannot be opened or Windows Defender can't open after uninstalling Avast, Bitdefender, McAfee, AVG.

One Windows 10 user from tomsguide said: 'A few days back I turned it off completely using group edit policy, but now when I try to put on the real-time protection slider, it asks for permission but then nothing happens.' tomsguide However, many users have reported that their Windows Defender can't be turned on for virus defense in Windows 11/10/8/7 when they click on the Turn on button.

Window defender windows 7