Suspicious Cloud 9 keeps trying to access my computer. Any advice?

Suspicious.Cloud.9.jpgA few days ago I downloaded one of those aggressive marketing trojans. I cleared out what I could find, but it keeps dropping new apps onto my computer, AND since then Norton has to block Supicous.Cloud.9 from accessing my computer. It tries everytime I boot up and then randomly during the day. The original app was a product called STARTSAVIN and soon after the CONDUIT product appeared. These products keep invading my start-up and end up in my systray. Any advice?