Im glad that you can access your data now.
As for the Nas Navi yeah, try turning off the firewalls like davo suggested first.
Also remember that the Nas Navi's main use is just to get basic info from the device, like the IP. If you already know the IP you shouldn't need to use the Nas Navi, especially if you have it working on another computer (not sure if you do or not though). But it is a great tool to use in trouble shooting.