someone asked me to help them sort out their computers. they were working fine now they wont connect to the net. one is connected to the router and the other is connected to the router via ethernet cable. both seem to have connections in network connections but i re ran the network setup on the main pc (the one with the router) and got a error message saying that the ip was comflicting with others on the network). i dont think this is the case but not sure. i changed loads of the tcp/ip settings on both pcs with no luck. what else could i try?