Error browsing my network with samba as master browser

[Andrea_Chiesa at unindustria.bg.it]

I have installed samba as preferred browser on a single subnet network. I
think it is become the browser. If I try to browse from win95 or NT wkst in
some cases is all ok in other cases I can't find any pc. If I try a net
show I get an access denied error.
Anybody has an idea?
     Andrea Chiesa