problems- join wireless network and ...

just got an airport express,
when i try to join my wireless network the yellow light just flashes and the airport utility(new version) no longer sees my express and then the only thing that works is to use the reset button.

my wireless network is a verizon always on with a WEP password - it does have a MAC code on it but i never have had to use that before and dont know what that is

i have tried to put a "?" in front of WEP password because i read that might help, did not work

also when i try to update the firmware it does not work

i have played songs in itunes to my speakers and that does work when in the default mode, so i am hoping the unit is not dead.

thanks everyone in advance for the help

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