How to load this to Mapsource on PC, I am really new to these things.

Mapsource is already installed in my system. I downloaded and kept this file in C:/Garmin folder but when I run mapsource it gives the following error
"Mapsource Could not find any installe dMapsource map products. please install one or more Mapsoruce map products and Star Mapsource again.


any help pleae?

thanks,
Buneri