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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.
2. Check to see if your Windows Defender is on. Go into your Control Panel then click System and Security. If you do not see Windows Defender that does not necessarily mean you don't have it. If you do not see it then close the Control Panel.Click the Windows Start Menu and in the search box type Windows Defender.Turn it on, and then let it do a full computer scan.f you do not see it then close the Control Panel. Click the Windows Start Menu and in the search box type Windows Defender. Turn it on, and then let it do a full computer scan.