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First I'd try to check that I can establish a TCP session to that port. I'd use WireShark or something like that. Use "netstat -a -n" to check that the port is open and bound to a usable interface. If that works and you see the session established, the second thing to look for is authentication. It may be that the server (the box that you want to connect to) is configured for authentication methods that the other box does not support. You said that the server is Win7 Ultimate, but what is the client? Do you have the same pair of OSes working over RDP on your other computers?

3 are Win 7 Ultimate and the 4th is Home Premium. I have almost decided that I need to format C and reinstall because something may be messed up. All the “normal” boxes are checked, but it just won’t even get close. I don’t understand why I can go from desktop to laptop no problemo, but not the other way. I thought I may have found some wrong entries in my firewall, but that didn’t work either. I’ve even stopped my firewall and it was broke, so I’m figuring that’s not the main problem.( may have a problem later but not if it’s not even running.) I will most likely go with 3rd party software if something doesn’t happen soon. It seems it wouldn’t work either if some port wasn’t open.