Have you looked at your Curse Client settings (Tools > Options > Games & Addons) to see where it is looking for your WoW installation? If it's looking somewhere other than where you are running WoW from (check the target of the shortcut you use to open WoW), delete the extra copy of WoW, and tell the Curse Client where to look for your real installation by clicking the Add A Game button on the Games & Addons options tab (if it doesn't find it automatically).
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