AirPort Express Cannot Join Network

Hello all,
I've tried searching and can't find this exact issue; please forgive me it's a dup.
I just purchased an AirPort Express to use with several Windows XP machines for AirTunes and printer sharing. I already have wifi set up using a 2Wire 270HG modem/wireless router.
Using the AirPort Utility, I can see the AX and go through the steps to "Connect to my current wireless network" and then "Join my wireless network". I give it my network name, password, etc., and it reprograms the AX but is then never able to connect to in after the restart.
I initially thought this was due to using WEP (even though adding $ before my passkey did not help), but I have since switched to WPA-PSK and am having the same results. Admittedly, I wasn't sure which of the WPA settings in the AirPort Utility to select, but I've tried both with no luck.
I have reset the AX and run through the setup at least 10 times! Really not sure where to go from here, except to turn off all security on the router and just use MAC address filtering to keep out the neighbors... but this seems like a pretty bad system.
Am I doing something wrong?
Thanks in advance,
Drew

Well, it looks like I've been wasting my time.
At the end of running the Utility wizard, I get the error:
"An error occurred while trying to access the base station. Make sure you network connection is valid and try again."
It then tells me it was unable to find the base station after restarting and forces me to quit the AirPort Utility. When I restart the Utility, it can then see the base station and everything works fine.
So, basically, I've spent the whole night troubleshooting a meaningless error message when everything was working fine.
Great. Can anyone explain why it's reporting this error if everything is fine?
Thanks again.
-drewz

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Just found solution from another post from Mark:
I had the same problem... couldn't get the AE to join the network. Here is how I got it to work. Go to the 2Wire config page in safari. For me it's <http://192.168.1.254> Go to settings tab. Go to LAN tab. Go to wireless heading. Under "Security", change "Authentication Type" to "WPA2-PSK (AES)". After the 3800HGV-B reboots, use Airport utility to configure the AE to join the wireless network. I have no idea why, but it works. The light is solid green and I can play Airtunes through my antique AE using iTunes or iPhone. Hope it works for you as well. Mark

HT1731 How does one configure a NEW (unconfigured) AirPort Express to join a WiFi network that has a non-broadcasted SSID?

The following KB article assumes that the user has a configured AirPort Express:
http://support.apple.com/kb/HT1731
I reset my AirPort Express, because the SSID of the WiFi network changed and its name is not broadcast for security reasons.
When using the "AirPort Utility" ( not the "AirPort Admin Utility" – which is the wrong name of the application in the article! ) the application found the unconfigured AirPort Express, connected to the LAN via ethernet; However, when selected, the configuration "wizard" assumes that the user wants to configure the AirPort Express as a WiFi base station.
I selected the option to have the AirPort Express join a WiFi network; However, the AirPort Utility sent back an error, saying that a "Base station" ( WiFi network?! ) could not be found. Well, guess what? That's because the SSID of the network I want the AirPort Express to join.
UGH!
...and the best part is that there is no other solution, but to run with the AirPort Utility's assumptions, configure the AirPort Express as a WiFi Base station, then follow the KB article's instructions ( which are not accurate ) to re-configure the AirPort Express as a WiFi client.
This is a really bad user experience, Apple.
Please try following your own instructions to see how fantastically they fail..then, re-write your KB articles.
Thanks,
PS — If anyone knows of any easier methodologies, do tell. (That's the "question" part of this inquiry )
PPS — My Mac Pro, which I used to configure the AirPort Express, does not have WiFi.
PPPS — Why do all the articles that match searches for "AirPort Express" return articles that refer to "AirPort Base Stations"?! Please, for the love of UX, be consistent!

Here are the basic steps:
Run the AirPort Utility
Select the AirPort Express
Click on Manual Setup
Click on the AirPort icon
Click on the Wireless tab
For Wireless Mode, select the "Join a wireless network" option
In the Wireless Network Name field, enter the SSID of the hidden wireless network you want the Express to join.
Select the approrpriate wireless security type in the Wireless Security window.
Enter the appropriate wireless security password for the hidden network.
Click on Update.

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can "extend" an existing wired network to serve as an additional wireless access point, which can also stream music. If that's what you want to do, connect its WAN port to an available LAN port on your router using an Ethernet cable.
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"Airport Utility was unable to find your AirPort device after restarting. The setting for this AirPort device was successfully updated, but there was a problem in joining the network or the Airport device."
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Hello,
I am hoping you can provide me with some help on this... I recelty acquired a PowerMac G4 with a 450 MHz processor, CD-RW/DVD-ROM drive, Zip Drive, 1 GB RAM, and two 40 GB HD... The system has OS 10.4 installed, and it is has built-in Ethernet...
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