I have displays running in several schools - some schools are using a display panel with an attached embedded XP OS. Others are running the displays from Windows 7 machines. The Win 7 are not having any problem but all but 2 of my XP machines are no longer running. When I manually click on Risevision player, nothing happens. None of the processes that should be running are doing so. I have uninstalled and reinstalled the players but to no avail. I can run same display on Win 7 machines in the schools. The TV's that are still running XP are ones that have been online without interruption. The ones that have stopped running have been restarted at some point. We are looking at policies and firewall settings from our network end but can't seem to figure out why this is happening.