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When you say preinstalled on your computer, are you refering to a 60 day trial of NIS2008? What does your Norton Protection Center say about virus protection? I can't find NAV either but I know it is integrated within NIS. I can run scans but do so through NIS.Now when you installed Norton system works NAV, I think you got yourself into some conflicts with NIS.
I run NIS2008 and NSW2008 on vista too but when I installed the NSW 'over' NIS, I only installed the Utilities such as WinDoc, etc. I also installed Norton Save and Restore.
I really suggest you use the removal tool and start over with a clean install.....Good luck