Problem connection laptop to Terastation after router upgrade

I just upgraded my wireless router from "G" to "N".

I have two desk tops, two laps tops, a Terastation and a Roku sharing it.

I had no problem getting all the various hardware to connect EXCEPT for one problem.

One of the laptops will not connect to the Terastation, All the other computers connect to it (the two desktops are Ethernet wired to it)

When I try to connect to the Terastaion using the laptop (an HP Pavilion using Windows 7) I get the following message.

" file and print sharing resource is online but isn't responding to connection attempts"

I have tried just about everything I can think if to get the laptop to see the files on the Terastaion (it did so just fine before I change the router) but nothing is working.

Any suggestions?

Thanks