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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.
In Windows 8.1 and 10, you cannot change Windows Defender service settings while Windows is running in normal mode. Again, in Windows 8 only: in the Windows Defender Service Properties window, set Startup type to Automatic and click Apply. Then click Start in the Service status section and finish by clicking OK. In Windows 8.1 and 10, you need to boot into Safe Mode first.