unable to install remote desktop services

Hello

 I am unable to install remote desktop services on the server2012  (not via GUI and not by powershell)

I get the error: "one or several parent features are disabled so curent feature cannot be enabled error 0xc004000d"

But uninstalling of the features is not possible too because I get "an unexpected error occured"

The server is an VM of server2012. It was upgraded from 2008R2 which had the terminalserver and DC role installed. But before upgrading to 2012 the DC roles were transfered, the Server demoted and the terminalserver roles uninstalled. But it seems there are remains from the old installation, because

Get-WindowsFeature | ? {$_.Installed -eq $true -and $_.FeatureType -eq "feature"}

reveals

RSAT

RSAT-Feature-Tools

RSAT-Role-Tools

as installed. but no sub features

and I am unable to install or uninstall the features

PS C:\Users\Administrator> Uninstall-WindowsFeature -name RSAT
Uninstall-WindowsFeature : unexpected error.
In Zeile:1 Zeichen:1+ Uninstall-WindowsFeature -name RSAT+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : InvalidOperation: (@{Vhd=; Credent...Name=localhost}:PSObject) [Uninstall-WindowsFea
   ], Exception+ FullyQualifiedErrorId : Provider_AlterationRequest_CBS_Session_InProgressAndNoRestartRequired,Microsoft.Wind
   ServerManager.Commands.RemoveWindowsFeatureCommand

Success Restart Needed Exit Code      Feature Result
------- -------------- ---------      --------------
False   No             Failed         {}

Windows internal database is not installed

Thanks for your help!