I've recently built a new Windows computer running Windows 8 Pro and installed iTunes onto it. I've discovered that AirPlay and Home Sharing are not working. I also have an iPhone and iPad that are able to flawlessly use AirPlay on my system, but my computer simply will not work with it. Home Sharing apps such as Remote can't find my iTunes library on the computer. I've tried everything suggested by the article: updating my AirPort Express firmware, reinstalling iTunes, disabling Windows Firewall... nothing is working. My computer is connected to ethernet and not wi-fi, but that shouldn't be the problem. What am I doing wrong?