Each computer on a network has to have a name.

All the computers have to use the same network name for the network.

In Windows Explorer, right click on "My Computer" and select properties. All the information should be there, and most of it can be changed at that point.

When setting up a Windows "Home Network" you need to set up the network on ONE COMPUTER ONLY. The network (workgroup) creation assigns a network address to the computer, and you can't change that address. Attempting to create a network on more than one gives you two computers with the same address, so if you try to go through Network settings to "create" the network on more than one computer things get pretty well messed up.

With early Windows versions you'd likely make a "transfer disk" on the first computer, and plug the disk into other computers to give them all the parameters. With WinXP and later, as long as you know the name of the network you can "join the network" with virtually zero setup on all the other computers.

To search for another computer on your local network, it may be handy to know that you prefix the computer name with a "double backslash" but even that usually is not necessary since WinXP because usually the system on any computer will find any available computers it might be able to connect to. (The Documents folder on the R:\ Drive on the computer named Godzilla would be \\Godzilla\R:\Documents.)

In Windows Explorer, right click on "Network" and click properties. It should take you to the "Network and Sharing Center" in Control Panel, where you should be able to solve any problems with sharing stuff between your (Windows) computers.

John