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If you need to disable it permanently, see After some period of time, it will be re-enabled automatically. Note: Windows 10 allows to only temporary disable Windows Defender with a special option in Windows Security. Alternatively, you can access it using its tray icon. You can launch Windows Security from the Start menu or with a special shortcut.
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The Security Center app is reviewed in the post Windows Defender Security Center in Windows 10 Creators Update. It includes all the settings related to Windows Defender. The application, formerly known as "Windows Defender Dashboard" and "Windows Defender Security Center", has been created to help the user control his security and privacy settings in a clear and useful way. Recent Windows 10 version come with is a new app called Windows Security. Microsoft is renaming the app Microsoft Defender. In Windows 8 and Windows 10, Defender is based on the Microsoft Security Essentials app which offers better protection by adding full blown protection against all kinds of malware. Earlier versions of Windows like Windows 8.1, Windows 8, Windows 7 and Vista also had it but it was less efficient previously as it only scanned spyware and adware. Windows Defender is the default antivirus app shipped with Windows 10.
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