What Addons do you think you have installed, and how did you install them? Where is World of Warcraft installed on your computer?
I recommend these clients for those of us that might not be so savvy with these big grey and black box thing-a-majigers ;)
Simply download the Client, intall, and use the client to do all of the work of installation, management and upkeep of all your add-ons.
curse.com has a brief tutorial for the downloading of the Client and its use.
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