TCP/IP

I recently started working here and have a small peer to peer setup using tcp/ip. There are 10 computers, 1 printer, 3 hubs, and 1 jetdirect. Recently one of the computers lost the connection to the network. The setup looks ok (all the computers arethe same and the setups are the same, I can ping everything on the network but cannot see anything in the windows world. Any help would be appreciated.

Faye