OS X 10.4.4 DOWNLOAD HANGING AT "Optimizing System Performance" STAGE

I began downloading 10.4.4 update about 1.5 hours ago; most of the download executed fairly quickly--within 10 minutes. But then the download got to the "Optimizing System Performance" stage, and has been hanging in it ever since. It's accompanied by the spinning beach ball.
Is this common, or at least normal?
If not, what should I do? How long should I wait? I don't know if I can even get my iBook to force quit at this stage.
thanks in advance for your help.
T.W.

Timothy,
What you are experiencing is not common or normal, but can hopefully be rectified.
According to iBook: If the Computer Won't Respond you can Force Quit by holding the power button for several seconds.
Restart from the Tiger Installation CD and run the Disk Utility as directed in the Try Disk Utility paragraph of Using Disk Utility and fsck to resolve startup issues or perform disk maintenance.
Next, attempt a normal startup of your computer.
Mac OS X: Troubleshooting installation and software updates says this about optimization failures:
Installation fails during "optimization"
If the installation fails during "optimization," all of the software was installed. There is no risk of an "incomplete installation." The optimization phase of an installation only affects performance and not stability or features. You may force optimization to be repeated by reinstalling the software. If you were using the Software Update pane of System Preferences on the first attempt, you will need to download the standalone installer of the same software from Apple Downloads in order to reinstall the software.;~)

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