Airport hijacking PC IP address (or something like that)

I have a G5 (running Tiger), iMac (running Tiger), PC (running XP) and a Snow Airport hooked up to a Router (XSense MIH-120 xRouter) which is in turn connected to my Residential Comcast Modem which is hooked up to their system and then the web.
All three computers are set up to get their IP's via DHCP which both Mac's do fine, but whenever I have the Airport turned on the PC is unable to access the internet.
It's as if the Airport is somehow hijacking the PC's IP address.
When I turn the Airport off and reset the PC it connects no problem. Turn the Airport back on and the PC loses connectivity again.
With the Airport disconnected I go into the Routers admin and set the starting IP's to 24 or whatever - to make sure everything is getting new numbers, and again the Mac's and the PC get their respective new numbers. I turn the Airport back on and the PC loses connectivity again.
Any ideas??
BTW I have the Airport to connect to yet another iMac in another room, but that's not part of the equation because it's off half the time, so the problem stops at the Airport which is also password protected.

I took your advice and disabled the internal router and now that it's working as a bridge between the iMac and the router things seem to be working fine. I haven't turned the PC on yet so I'm not sure if this will screw things up like it was before.
I don't think so though, because after performing a hard reset and following Apple's step-by-step instructions http://docs.info.apple.com/article.html?artnum=106685 I had to type in specific IP information into the corresponding fields to access the ABS.
Before, when I accessed the ABS to set it up I connected to it straight away after hooking up the ethernet cable.
So now, at least, I have the latest software in the ABS and the router disabled, so time to fire up the PC.....

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