Follow these steps to create the hidden share:
Note: If your computer is already sharing network folders, it may take up to 30 minutes for this command to take effect and hide the computer name.
Users who have access to the hidden shared folder can get to it by using the UNC name or by mapping the hidden share to a local drive letter.
To unhide the computer, type
net config server /hidden:no.
Links:
[1] http://pulse.veltsos.com/category/it/software/software/os/microsoft