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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.
1 Double-click the Windows Defender service, and then in the Startup type box, click Automatic. 2  Click OK. 3  If the procedure in step 1 does not resolve this issue, uninstall and then reinstall Windows Defender. 4  To do this, follow these steps: 5  Click Start, click Run, type. , 6  and then click OK.