I have an airport express (AX) in the main living room hooked up to the speakers. The AX is hooked to the network via ethernet. I have a PC running windows XP and the latest greatest version of iTunes. The PC is on my home network via ethernet. In the AX settings I have selected the box that says "enable streaming via ethernet". Everything was working great! Then yesterday, the remote speakers stopped showing up in my iTunes. I have not been able to figure out why, or how to fix the problem. Any advice? Im literally ready to pull my hair out. It should be noted that, the speakers appear fine on my Macbook running the same version of iTunes. I am not running windows firewall.