When you enable this setting, it will prevent Internet Information Services (IIS) from being installed, and you will not ...

When you enable this setting, it will prevent Internet Information Services (IIS) from being installed, and you will not be able to install Windows components or applications that require IIS. Users installing Windows components or applications that require IIS may not receive a warning that IIS cannot be installed because of this Group Policy. Enabling this setting will not have any effect on IIS if IIS is already installed on the computer.