No wireless Internet after  the lastest security update

Everything was working fine,but since i did the latest security update,...i noticed my wireless internet connection was getting weaker and weaker and now i can't connect anymore.
I'm using a Belkin PCcard in my Powerbook G4 Titanium 867 GHZ
Connected to a Belkin Wireless router.My Belkin Card is recognized as airport express in the system profiler.
We also have a Ibook G4 800GHZ with an orginal airport extreme card , same problems too, no connection to our Belkin router.
As i wrote earlier everything was working fine.....
internet works fine with the standard UTP rj45 cable..
What i did , Repaired all the permission, restarted the router, removed the airportkext2 file as suggested on some postings etc etc (later put it back ofcourse)... but no solution...
Must be something with the latest, update I hope Apple solves this issue soon, any help from you Macwizards really appreciated.
Powerbook G4 867GHZ, Ibook G4 800GHZ   Mac OS X (10.4.9)  

I think the cure is to roll back the Airport kext...
http://discussions.apple.com/thread.jspa?messageID=4310165&#4310165
Thread with other links...
http://discussions.apple.com/thread.jspa?messageID=4457204&#4457204

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