Windows 10 Server Preview - How to Disable Windows Defender
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# Get information about Server roles and features that are available or installed

Get-WindowsFeature

# Turn-off real-time protection

Set-MpPreference -DisableRealtimeMonitoring $true

# Check real-time protection status

Get-MpPreference | FL *RealtimeMonitoring

# Turn-on real-time protection

Set-MpPreference -DisableRealtimeMonitoring $false

# Install Windows Defender GUI (no restart required)

Install-WindowsFeature Windows-Defender-GUI

# Uninstall Windows Defender and its GUI (restart required)

Remove-WindowsFeature Windows-Defender, Windows-Defender-GUI