Read all 10 replies. My thought is that some advanced methods may be required to remove but I really think some trojan or such is making trouble. Try Grif's scans at http://www.cnet.com/forums/discussions/how-to-remove-pup-option-603542/#post-f742c795-5881-433b-a29b-6d758efe5cd3 and if that fails, just sign up to Bleepingcomputer.com to make a request for a hand in possible malware.
As to advanced removal I'm thinking Revo Uninstaller and the usual items we find with AUTORUNS (see google.) The problem is that I doubt these advanced removals (beyond Revo) are documented well enough for new users. Nod to bleeping.

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