Airport Express breaking my base station network?!?!?

I've had an AEBS and Airport Express installed in my home for about a year. I use them with my PBG4 and iMac G5, both of which are running 10.4.3. The Express is mostly just a range extender for the PBG4. Airport Admin Utility v5.6.
I recently purchased a Dell 6000 and it connects to my network well. However, sometime during my setup of the Dell, I used the Airport Admin Utility on the iMac to change the WEP settings for the base station (the Dell said it required WEP 40 instead of 128 like I had on the original network). Since uploading changes to the AEBS and reconnecting the iMac, Dell and PBG4 to the network, the following occurs...
If I keep the Express unplugged, I don't have any problems. BUT, if I plug it in and get too close to it with any of the computers (I've tried with both laptops and plugging it in near the iMac) then I can't connect to the internet any longer. The Airport menu says I'm connected to my network but that I'm NOT connected to the internet (if I try to launch safari or firefox). If I unplug the Express, the connection returns and I can surf again. This happens with ALL my computers.
My concern is that I changed a setting in all the computers and the AEBS that is keeping the Express from connecting properly. BUT, none of my Airport software (Admin utility, setup assistant) can find the Express when it's plugged in and steady green light??? The only "base station" available is my main AEBS but the Express is AWOL. I just can't figure out how to make the computer find/see the Express. I know it's working because it is breaking an internet connection when it's plugged in
Any thoughts on what I need to do to be able to see and edit the configuration of this Express?

Make sure you do a factory default reset of the Airport Express per:
http://docs.info.apple.com/article.html?artnum=108044
Run the Airport Admin Utility and use it to clean up the configuration of the Airport Base Station:
- under the Airport tab, make sure the option to "create a closed network" is not checked
- under the Access control tab, clear all entries
- under the WDS tab, clear all entries
Then (temporarily) put the Airport Express and the Mac you are using for the configuration in the same room as the Base Station. Run the Airport Setup Assistant, and use its guidance to configure the Airport Express as a new Base Station that "extends" the existing wireless network created by the Airport Extreme Base Station.
If you still have problems, make sure you are not using the problematic firmware version 5.6 (Base Station) and 6.2 (Airport Express). The version you should be using are available at:
http://www.apple.com/support/downloads/airportexpressfirmware611formacosx.html
http://www.apple.com/support/downloads/airportextremefirmware551formacosx.html

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