For windows 7:
you go to appdata folder (simply type %appdata% on your browser bar)
After that you go to MediaCoin folder
right click on a blank/white part of the browser and say: create new ".txt"
after that you rename the new txt file to "MediaCoin .conf". if you getting ask that could damage the file hit "ok" so you can rename it.
As last step you want to pen the file and post the DEVs config/addnodes in it.
Should be syncing then like a charm.