Since Easy-search shows the unit, and thus the IP, you could try the following:
As far as I understand, the Configuration button just opens the webpage, so you can try entering in your favorite browser "http://<IP>" (e.g. http://192.168.0.32 with default IP).
However, it seems you really want to access the data on the drives, so you could open Explorer, and type "\\<IP>" (e.g. \\192.168.0.32) and see if a network folder will show up.
If neither of these work, it is clearly not the fault of easy_search program, and you should check the unit's IP, your firewall, etc. as the other folks are suggesting. One other thing to check - perhaps your "File and Printer Sharing for Microsoft Networks" is disabled?
Hope that helps