microsoft defender windows 8

I just bought a new computer with windows 8, it has a free trial to Norton which I don't choose to use. When I try to access windows defender it says it has been turned off, how do I turn it on? I went to settings but I don't see windows defender

相關軟體 Windows Defender 下載

Windows Defender is an application which helps protect your computer against pop-ups, slow performance and security threats that are caused by spyware and other malware, by detecting and removing thes...

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