AirPort Express problem on MacBook Pro

I'm having problems connecting to the internet via work place LAN while booted up in Lion.  Sometimes I can go into settings preferences or what ever that's called and get it to work by trial and error but it's very difficult.  Right now I'm using AirPort Express connected to the LAN but I get the same problem when connecting directly to the LAN.  And again I can sometimes get conection by trial and error but with great difficulty.  What's strange though is that when I boot up into Windows 7 bootcamp I get a connection emediately with no problems.

I had the same problem. The Airport Express (used to provide ethernet access to a G5) would join my b/g 2.4Ghz network (from Dual Band Airport Extreme) instead of the 5Ghz "n" network (from same Airport Extreme)
Oddly, when I changed my Dual Band Airport Extreme from "802.11n only (5GHz) - 802.11b/g" to "802.11n only (5GHz) - 802.11b/g/n" my Airport Express would join the 5Ghz network fine.
This seems to be somewhat finicky, but i've got it working the way I want at the moment with the current settings:
Airport Extreme:
Create Wireless Network
802.11n only (5GHz) - 802.11b/g/n
Channel (Manual) 161, 1
Use Wide Channels
Airport Express:
Join Wireless Network

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