New Macbook Pro. wont connect to wireless network once it has had a update

hi
bought a new macbook pro last week, when you first start it up it connects fine to a wireless network, but once the software update is compltete it says that there is an error trying to jion network. there is already a powerbook g4 connected to the network and a pc. i have re installed tiger and it can connect fine until the software update has restarted the mac and the same error is back again. do i re install it again and never update it or is there a simple way to correct the fault

My girlfriends New Macbook Pro is doing the same thing. I does connect to non-secure wireless connections such as at the airport but doesn't connect to her home wireless connection that is run by an SBC DSL 2WIRE gateway. I can connect fine on her old IBM laptop that I am on right now through this network wirelessly.
There has to be a fix for this?

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