Part of your problem may lie in the fact that you are running two antivirus programs. You should decide which you prefer, McAfee or Norton, and remove the other. Better yet, switch to AVG (free) or Nod32.
You can also follow the suggestions in the links below, and if you continue to have problems, post a HijackThis log to help us see what's going on.
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Posting Maven
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since Jul 2004