thequeenofmusic, this may sound stupid but are you sure you're using MSN Messenger v7.0.
813?
Skins are highly version dependant and must be used on the correct version of MSN Messenger, otherwise they can't patch it.
To check your version of MSN Messenger, in the main contactlist window go to
Help > About MSN Messenger. There you'll see the complete and correct version number.
If it isn't 7.0.813, then first update your msn messenger:
http://messenger.msn.com/