nt

hi ,,question i was recently working with nt server
on one of the pc,s i could ping the server,and also the server could ping the pc,when i tried to right click the pc from the server i got a error message
saying \\could not be found or something like that,
i cant remember,any ideas,and also if the is any good info on nt permissons i would appreciate the link. ps the pc is part of a workgroup.)