ERDASL APPOLO Essentials 2013 install information error

Hi there,
I have read the installation guide as I guess there was some problem with the ERDAS Foundation 2013, but I have found that Apollo doesn't need Foundation to execute. As I proceed to install the Apollo Essentials 2013, this window appears. Any solution for this error ?
Thank you !

Missing the following required minimum prerequisites :
Internet Information Services 7.5
Please refer to the Supported Environments link in the Intergraph Setup Manager.
OK
