Sometimes is good to be anonymous and prevents accidents from others trying to connect to your computer, this is to hide your computer name from others computers in the same network under network in Vista.
to check if is hidden first. open a command prompt or CMD.
> net config server
look under Server Hidden if says yes theres nothing more to do is says no you can hide it by typing.
>net config server /hidden:yes
enter and restart.
*this will not take out the ability to browse your computer if you know your computer name. this only hide the name from the network