With most major AV companies you will need to renew your AV subscription to continue receiving virus defination updates.
If you don't renew your subscription then you will not receive the latest virus defination updates. This means that you won't be protected from new viruses.
You can do 1 of two things
1) Renew your NAV 2004 subscription
2) Uninstall the software and find yourself a free AV scanner.
Hope this helps
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