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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 Defender includes a command-line utility, MpCmdRun.exe, which can be handy if you want to automate the use of Windows Defender. The utility is located on Windows 7 at %ProgramFiles%\Windows Defender\MpCmdRun.exe. The basic usage at the command prompt is: MpCmdRun.exe [command] [-options]