Don't forget to delete (or rename) your "SavedVariables" files if you're doing a
complete reinstall. They can be found at:
Path to your WoW folder\WTF\Account\ACCOUNT NAME\SavedVariables\
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Bear in mind that doing this will
completely reset everything, on every character, back to default. Your Carbonite will look and act like it was just installed for the first time on all of your characters.