Lenovo T400 cannot authenticate with WRE54G

I recently got a new Thinkpad (Lenovo T400) and am having trouble getting it to authenticate with my Range Expander (WRE54G).  My Xbox360 and my wife's laptop have no trouble authenticating with Static WEP but I cannot.  If I move towards my Router (WRT54GS) and select that access point it authenticates and picks up an IP address no problem.  What's up?  Thanks.

Which operating system you are using on the laptop ?
Which wireless card you are using on the laptop ?
If you are able to see the network name on your laptop but unable to connect then you can try updating the wireless adapter of your laptop as your other wireless devices are working fine.

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