I've shared a folder on the root of the C drive and given everyone read access, just as a test. In network sharing center I've disabled password protected sharing.
Whenever I browse to this server from a different machine (\machine) I get prompted for a login. When I try to browse directly to the folder (\machine\public) I also get prompted for a login.
So despite the fact that password protected sharing is disabled it still isn't allowing anonymous access.
Suggestions would be very much appreciated. Thanks