Start the scheduled scan only when computer is on but not in use

This policy setting allows you to configure scheduled scans to start only when your computer is on but not in use.If you enable or do not configure this setting scheduled scans will only run when the computer is on but not in use.If you disable this setting scheduled scans will run at the scheduled time.

Policy path: 

Windows Components\Windows Defender\Scan

Scope: 

Machine

Supported on: 

At least Windows Server 2012 Windows 8 or Windows RT

Registry settings: 

HKLM\Software\Policies\Microsoft\Windows Defender\Scan!ScanOnlyIfIdle

Filename: 

WindowsDefender.admx

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