When configuring a Virtual Desktop Infrastructure using Remote Desktop Services in Windows Server 2008 R2, you need the Remote Desktop Virtualization Host role service. Enabling that on a Windows Server 2008 R2 system with the Full UI  is rather straightforward. DISM: dism /online /Enable-Feature /FeatureName:VmHostAgent – ! Make sure you type VmHostAgent with correct casing ! PowerShell: Add-WindowsFeature –Name RDS-Virtualization

To search for available features on Hyper-V Server; you can either use DISM: dism /online /Get-Features /Format:table Or PowerShell: Import-Module ServerManager  and Get-WindowsFeature

Source:→ TechNet