you can get NAV to scan a particular folder by double clicking the icon in your task bar, select 'scan for viruses' and click 'new'. This will open the scan wizard. From here click 'add folders' then find PocketPC documents. Mine are hidden in My documents. Click next then name the scan as IPAQ or whatever and click finish. This will put the IPAQ scan in the NAV window where you can double click and scan your IPAQ.
Hope this helps.