You did not download the right files nor are you doing the right stuff.
Lets start from the beginning. Follow the instructions closely.
If you had / or have previous installations of Mapsource that do not work or have problems, please do a COMPLETE uninstall inclusive of REGISTRY removal else the problem will continue to haunt you.
Download Mapsource Recommended Old version 6.13.7 via below link
http://www.sendspace.com/file/2siza6After download, run the install file. This will install Mapsource into your computer
After the installer is done, do not run mapsource as there are no maps and it will report an error if you do so
Download MFM from this link
http://www.1gps.com.my/download/garmin.aspxAfter download, run the install file. This will install MFM into Mapsource of your computer
Run Mapsource. The MFM map should appear
If you want to go to Garmin website and download the latest Mapsource update file
After download, run the install file. This will install the latest version of Mapsource into your computer