There is some sort of dodge with NAV 2002, I beleive. Basically if you can delete any trace of it having been on your PC, then reload, you can get another years subscription to online updates for free.
It worked on my sister's PC which I just had to reformat cos it got completely borked with spyware and all sorts of junk that hadn't been cleared out since she bougth it 5 years ago (only used for occasional email and WP work so she don't need to upgrade for now).
On that basis NAV 2002 is a good economic program, and probably not worth upgrading