Okay. (1) The ones that do have Vue on them also have the rendercow, I hope? Vue itself will not function in that capacity, unless each iteration on the network has a different liscence and registration number (if I'm remembering correctly; it may be that Vue only functions as the network controller for the rendercow(s) ). (2)There needs to be a rendercow installed on the host, as Vue can't render when it is controlling a network. If the actual installs are correct, the next thing to try is to add the undetected boxes by -name-. Find out what they are named as in the network environment, and add them one at a time. If that fails, then look at any antivirus and firewall software you are running. XP has it's own, and may be blocking port 5000 by default. Those are the most common 'ooops' with the HyperVue setup. Beyond that, and it gets more technical...