Had it working before I had to re-install Windows.
Main PC running Windows 7 Pro.
Other PC is running Linux, Samba.
Using a wireless router at main PC end.
Both machines can ping the router and each other.
But Linux machine is not visible in Network.
Have a BluRay player on network as well, and it sees the main PC.
Set as Home network.
File and printer sharing turned on.
Network Discovery turned on.
Password protect turned off.