Powerbook freezing after software update

I have a Powerbook G4 17" that has been rock solid for two years--it has never had this problem before.
Last week, after installing "AirPort Update 2005-001 (1.0)", the machine has been freezing (with frozen cursor) at least once per day during random work, for example, while using Word, Final Draft, or browsing the web with various browsers. Most annoyingly, it often happens while I'm simply reading the screen and not even causing any action to occur. I haven't installed any applications for the last few weeks. No maintenance or upgrades have occurred other than automatic updates.
Normally, I would suspect RAM in a random crashing incident, but this machine has 2GB of Apple RAM that has been installed the entire time and has never had any issues. I've run Rembra RAM checker against it just to be sure, and it reports no problems.
I've gone through the logs to see if there's anything posted, but the freeze apparently locks the machine up solid--there's no indications in the logs except normal activity from the subsequent reboot.
Just to be thorough, I ran a verify permissions and verify disk, but both were clean.
I'm extremely frustrated about this. Is there any way to roll back or remove this update?
Matt

Okay, turns out it's the lower RAM slot that has suddenly gone wonky. The Machine is stable with just 1 RAM module in the upper slot, and both modules work in the upper slot. The machine has the crashing problem with either module in the lower slot.
Is anyone else having this problem after updating to OS X 10.4.3?

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Powerbook freezing after software update

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