How do I uninstall and addon for Mass Effect 2?

I have Mass Effect 2 on PC and installed the Zaeed addon. When I start the game it isn't there, I want to uninstall it and reinstall it, but not the whole game.How do I uninstall and addon for Mass Effect 2?
You go into the hard-drive and delete him off there. That's an excellent idea! I ******* hate that guy.

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