New "Shared" Computer showing up?

Hi,
All of a sudden, I have a new device showing up in my "shared" list on the left side of my open windows. I'm not sure where it came from or how to get rid of it. I've searched the threads here, but couldn't find the answer, so would appreciate any help.
I have a G4 Tower connected directly via ethernet to an Airport Extreme, using a DSL modem. I also have a MacBook that connects via Airport, and it also shows this unknown device. When I "Get info" on the device, it says it's a "PC Server" but no more info, and clicking on it shows two folders, "D" and "SharedDocs," and that I'm connected as: Guest.
I've never put any password on my network (we live in a pretty rural area, so never felt the need). But I'm wondering if it's a neighbor's computer showing up?
How do I get rid of this icon?
Thanks,
Mark

Mark Nadell wrote:
All I can think of, in my case, is that there was a neighbor that somehow got on my "Shared" list.
There is no "somehow." You neighbor was "stealing" your WiFi. Let's hope he was not smart enough to access your computer.
If you run the terminal command
last
you will see all the logins.
I changed my Airport Network to WPA security (from no security at all), and the "rogue" device is no longer there.
You should be using WPA2 - even WPA has been compromised and WEP is a joke these days.
Eventually everyone will learn to use WPA2.

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