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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.
Turn Windows Defender real-time protection on or off. 1  Select the Start button, then select Settings > Update & Security. 2  Select Windows Defender, then turn Real-time protection on or off.