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1 Click Tools at the top of the Windows Defender Window. 2  Click Options in the Settings section of Windows Defender. 3  Click Default actions.  Set the default actions (recommended action based on definitions, Remove, or Quarantine) for each level of alert and then click Save.
%ProgramFiles%\Windows Defender\MSASCui.exe. 1  Click on OK to open Windows Defender window on your screen. 2  Run it and tap on Settings tab. 3  Then click on Administrator from the left pane. 4  Untick the given checkbox Turn on this app. 5  Click the Save changes button to confirm which you have done.ow to enable the Windows Defender on Windows 10. Tips 2. 1  Launch Control Panel from the digital assistant Cortana. ( 2 You can choose your own way of opening Control Panel). 3  Choose the Action Center under System and Security option. 4  You see the notification that Windows defender is turned off below the Security label.