I tried to install a HP printer driver package that obviously needed .NET 3.5. The installation failed for some reason and I canceled it. Now, on login of all users, the system tries to finish the .NET installation, but fails. The error dialog says "The following feature could not be installed: .NET Framework 3.5 (contains .NET 2.0 and 3.0)."
Apparently this is a conflict between System-control "Windows Features" and the Server Manager (I am not sure about the English names as I am running a German version).
I now simply want to get rid of the error message and cancel the installation completely. How can I achieve this?