windows installer

every time i start my computer windows installer appears followed bya
window containing the words installing norton antivirus 2005. after a
few seconds another window appears telling me that help does not support
norton anti virus 2005 so must uninstall and reinstall. i have norton
internet security 2005 which works perfectly well. how can i get rid of
this during the start up procedure. any help very much appreciated




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jamesskelly