Home network setup w/ Linksys WRT110. Can print to HP C5100 from wired desktop or wireless laptop. If printer is hooked to router, HP scanning software says "Error communicating w/ scanning device." Shut my FW/AV down & had no effect. If connect printer to PC w/ USB, scanning software works fine. There's no problem printing over the network, so the printer has an IP address from the router (verified from printer). Any suggestions? Thanks.