Strange computer on my Computer-to-Computer Network

I'm on my computer and I just noticed a strange computer ("LeeMiser's Computer") listed under the Computer-to-Computer Network heading on my connectivity icon for my Airport. I'm using 128 Wep Protection with a password (and just changed it) and checked "create a closed network" option on the Airport Admin Utility (which is supposed to hide my name from neighbors) but this computer is still showing up under Computer-to-Computer Network. Is this person tapping into my wifi. Why can't I get rid of him?

A Computer-to-Computer network or Ad-Hoc network is created by the AIrPort Extreme card built-in your Mac. It does not rely on a separate wireless router ... so the AirPort Utility settings are independent of this type of network.
Instead, a Computer-to-Computer network is controlled via the AirPort icon in the OS X menu bar. The only security setting available is WEP. WEP, as you are most likely already aware, is no longer considered a secure standard ... and can easily be "broken."
It is possible that someone has figured out your password. The question that remains is do you really need to have a Computer-to-Computer network or is your real goal to connect your Mac to a wireless router?

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Message Edited by JANATION on 01-12-2010 06:05 PM

Make sure File and Printer Sharing is Enabled...Also make sure both the computer's are in the same workgroup...
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