I am having a similar problem.
I have installed NR Free on two Win 7 machines. The server checks out ok using the Check Status tool.
The remote client has logged onto the network fine and it shows in the list of computers.
The server's client would not log in using default settings (I guess maybe to my router not liking hairpinning) so I tried a couple of things. In the main client connection dialog, I pointed it to itself (127.0.0.1) instead of using the domain name. That got connected but I could only see the remote client in the computers list still.
I tried changing the connection options / server local address and directed the client to 127.0.0.1 there. Then tried the domain name in the main connection dialog. That would not connect at all...
Also I note that the windows virtual adapter shows disconnected even when I have got the network explorer connected to 127.0.0.1
Not sure what to try next. Any suggestions very welcome
So ready to get off horrible slow Hamachi and so nearly there I hope.
Many thanks
Michael