Can't block neighbor from network...

I have an Airport base station connected to a DLink wireless to extend signal into house from office. Under "Shared" in Finder I keep seeing a "mac###########" on that list. When I go to get info it shows it as a PC. There's 4 MACs here that I use and no PCs with Windows. I've tried putting in password for signal, I've tried blocking its MAC address, and I've tried not broadcasting the wireless signal. I am still getting this "neighbor logging in". I noticed when I change the network name and did all those things, he disappears for a little while then comes back on.
I also notice on the DLink router settings page, under Log, it shows someone as "Spoof attack". It shows the IP it gave him and the port he is accessing. So after this I tried blocking the IP address through DLink, I am STILL seeing him on the Shared list. Any tips on what else I can do to stop this person from logging on to my network?
I've done everything I knew how to do but he still pops in. Thanks for any help
PS: I also use a Netgear Network Hub to spread the connections from DLink. I was thinking maybe this hub was the one acting as the pc, but I can't find a way to access the settings on it or something like that to check. I ruled it out when I saw the "Spoof Attack" on DLink. I looked up "spoof attack" and what it does is tell the router the computer knows the password for the signal, AND the hub is NOT a wireless hub. Thanks again.

See my reply to this post:
http://discussions.apple.com/thread.jspa?threadID=1505626&tstart=0

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