New Security Update - Airport no longer works. Help ?

Hey all
this morning I ran various software updates: itunes, safari and the new security update. From that moment onwards, I cannot access the internet using my MacBook (about a year old, running Mac OS X 10.4.11). I normally use Firefox to access the net, but neither that nor Safari work now.
I know my internet works as I can access it wirelessly using my work laptop and my desktop.
But when I try to access my broadband using my macbook:
a) the "waves" on the airport all remain light-shaded
b) I receive an error message saying " There was an error joining the Airport network 'Zyxel' " (the router is zyxel).
If anyone has any thoughts on how to reset the connnection back to how it was, I'd be EXTREMELY grateful.
thanks
B

Having the same problem, but only with my Mac. PC and iPhone continue to work fine. Must be security update related. Is there a way to uninstall the security update?

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http://support.apple.com/kb/DL1482
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http://www.timdoug.com/unpkg/
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6/4/11 8:59:24 AM    com.apple.notifyd[12]    EV_DELETE failed for file watcher 19
6/4/11 8:59:24 AM    com.apple.notifyd[12]    EV_DELETE failed for file watcher 18
6/4/11 8:59:24 AM    com.apple.notifyd[12]    EV_DELETE failed for file watcher 17
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