I would try the online Norton Diagnostic tool

  Giggle n' Bits 01:54 30 Oct 2004

go into the Help & Support and look for online support, select your product and let it scan your machine.

It will then tell you whats wrong and how to fix with which download. I suspect is a corrupt update. Should it be SP2 running It could be the WMI Patch or Liver update tool being dated.

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