Just in case the folder structure messed up go to your game folders addons folder and you should see the following folder structure
Carbonite
Carbonite.toc
Bagnon
Bagnon.toc
Basically inside the Interface/AddOns folder should be a folder with the name of the addon. If it has version numbers then it was installed incorrectly somehow. If you then open up that addons folder you should see at least a TOC file with the SAME name as the addon folder. If that isn't the case then that is another reason it isn't working.
Are you using Minion to install or self extracting ?
Check the above out and confirm. If you are not sure what to look for then make a screenshot of your Interface/AddOns folder and attach it to your next post.
There is also a useful FAQ thread here
http://www.wowinterface.com/forums/s...ad.php?t=14762 that will explain something similar and possibly more in a bit more detail.