How do you remove previously added computers?

Just a little while ago, I noticed some unknown device appeared on my "Computers" box on the "My Network" menu. I don't know the origin of this device, but I would like to remove it from my wireless network as soon as possible (especially if it's from an outside source). However, I couldn't find anything telling me how to remove previously added computers/devices.
Oh, and if this device is from an outside source (e.i. hacker), I just activated my router's security settings as a precaution.

I had the same problem--an unknown computer suddenly showed up on my secured network and I was notified. I changed my encription but that computer is still listed. Is changing the encryption good enough? It makes me nervous to see that computer sitting there without knowing where it came from and whether it is actually able to access my network.

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