We're getting WF4 installed. They got it installed okay on 3 machines and got to mine and keep having the same problem~PTC.Setup isn't finding the MAC address (hostid) on the NIC. It errors and won't even start the installation. I've got WF2 installed already (so did the other people who installed successfully) so it'll install something; IPCONFIG /ALL returns all the expected information, including the "physical address"; all the network stuff, mapped drives, internet and web apps working normally. There's a call in to PTC Tech Support which is, so far, unhelpful. I'm out of ideas, anyone else want to take a crack at it? David Janes