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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.
Windows 10 users have to do this. Open Settings > Update & Security > Windows Defender. Here make sure Real-time protection and Cloud-based Protection is turned off. 2] Using its UI. To disable Windows Defender in Windows 8, Windows 7 and Windows Vista, open Windows Defender > Tools > Options. Now uncheck Use Real Time Protection check box and also Use Windows Defender under Administrative Options check box. Click on Save. There is one more thing all Windows users can do.