Norton Antivirus is crap. Its scripting is fairly poor. Use an antivirus like Panda or Trend Micro. Norton has 70466 virus definitions as of today.(yes i used norton but then realised it was garbage. It is the world's most trusted anti-virus but check and see which is the best by doing a simple search in a search engine. My Panda Internet Security 2005 has 102833 virus definitions. 32367 difference between these 2 programs.