As we worked out the update issue, one other PC stopped connecting while I was in front of it. I tried changes cables, another router and other network cards. Nothing has worked. I tried shutting down everything and rebooting as shown here on the site but did not work. At this point I don't have the router connecting to the internet because of various issues as wall plugs and having to run cables around my house so that is not a concern. I just want these PC's to talk to each other to share files and print. Oh, I also took the PC we have been working on to a local shop where it worked fine, go figure. They were able to get on their shop network no problem.
Let me know if you need any other info!