I've uninstalled and reinstalled Media Center 30 again, updated any video card and tuner card drivers that needed updating, and turned off all firewalls and the antivirus software for a short time in both PCs. The networked PCs (running Media Center 29 or 30) are still unable to find the tuners which are installed in the entertainment PC (running Media Center 30). If the entertainment PC runs Media Center 29, no problem. The networked PCs run both Window 8.1 and 10. Hopefully when a newer version of Media Center 30.0.15 is available, a new install will rectify this problem.