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UGetFix.com says:
Dear visitor,
If Windows Defender gets disabled automatically as soon as another anti-virus program is installed. Thus, you won't be able to enable it as long as third-party tool won't be removed. If you are not using another security tool, but Windows Defender is disabled anyway, you can find instructions how to turn Windows Defender on here.
If Windows Defender is turned off by Group Policy and you keep getting an error “This app is turned off by Group Policy” when trying to launch it, try the methods provided on this post.
This solution has been deemed correct by the post author
If Windows Defender gets disabled automatically as soon as another anti-virus program is installed. Thus, you won't be able to enable it as long as third-party tool won't be removed. If you are not using another security tool, but Windows Defender is disabled anyway, you can find instructions how to turn Windows Defender on here.
If Windows Defender is turned off by Group Policy and you keep getting an error “This app is turned off by Group Policy” when trying to launch it, try the methods provided on this post.
Good luck,
UgetFix.com team