Seeing unknown servers on my network (Follow-up Question)

This is basically a further question as to the issues raised in this thread:
http://discussions.apple.com/thread.jspa?messageID=6803445&#6827736
Okay..... so i've gone searching trying to find something in regards to this problem and thus far have got nothing but it is more that i am worried from a security perspective who this extra "server" is. If it has been discussed at length please post a link to the solution please...
So i've got this "pc server" connected to my network under "mac001ec213105b" and have gone through the following steps:
1. I was using an extreme (main) and express (repeater/extender) but after my brother got a new iMac there was no need for the express. So i've just got the extreme running, changed the network name, changed the name of the extreme, changed the password and it initially worked before it reappeared 10 minutes later.
2. From another thread i went through the following (AirPort Utility > Manual Setup > Advanced > Logging & SNMP > Logs and Statistics) to see who was logged into the network. In wireless clients, all the computers running are accounted for however DHCP clients 3 different MAC addresses come up. One came up as soon as i turned on my ps3 and two i have no idea about.... One of them is in the Finder sidebar when connecting to shared computers and the other is a mystery?
So my question is who are the randoms? Obviously they don't have my password but can they still access my network without it? Or is it that i don't understand the definition of a "DHCP client" and if so could someone point me in the direction where i could find more info on it?

I remember in the previous versions of OS X, in system preferences>sharing it had an option "PC sharing" which is no longer available. Would this option be somewhere else in order for me to disable that type of functionality?

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NOTE
This
response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you.
Microsoft
does not control these sites and has not tested any software or information found on these sites.
Yolanda Zhu
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Got a Question? Ask BEA at http://askbea.bea.com
The views expressed in this posting are solely those of the author, and
BEA
Systems, Inc. does not endorse any of these views.
BEA Systems, Inc. is not responsible for the accuracy or completeness
of the
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Seeing unknown servers on my network (Follow-up Question)

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