I have similar problem to that mentioned many times on this board.
I have a network between 2 computers running XP and a laptop running vista basic.
It worked fine until recently.
Now when I try to view workgroup computers I get the error message: "workgroup name" is not accessible. You might not have permission to use this network resource. ...
I have gone through previous similar questions and have made sure enable netbios over tcp/ip is checked and that file sharing is started.
I am still not able to connect from 1 computer to the other. From the laptop running vista I can see the other computers but when I try to click on them get an error message saying windows cannot access that computer.