All I can say is I had the same problem, uninstall NAV2002 (manually clean Registry) then try to install NAV2003 and I got the same error. Tried different copies, still no luck. My fix was to install Mcafee VirusScan Pro 7.0 which I actually like so far and seems to be less of a drag on the system especially at startup.
By the way NAV2002 would reinstall no problem.
Good Luck
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