Undo Mac Mini Update?

I have a couple of friends who own a 2006 Mac Mini running Tiger. They tried to do a software update, but it failed. Then when they would try to boot up, they would just see the gray Apple logo screen with a never-ending rotating line status icon.
I was able to boot in verbose mode. Here are the last few messages I saw before the hang on bootup:
Configuring kernel extensions
/etc/rc: line 226: 26 Bus error kextd
mv: /System/InstallAtStartup/System/Library/PrivateFrameworks/NetworkConfig.framewo rk/Versions/A/Resources/version.plist: No such file or directory
/System/InstallAtStartup/scripts/1: line 5: 31 Segmentation fault /System/Library/PrivateFrameworks/Admin.framework/Versions/A/Resources/activate Settings
How can I correct this? Is it possible to "undo" the updates? I have not been able to boot into the desktop, so any resolution will require the Terminal program after booting off the installation DVD, etc.
Thanks,
Dennis

specklesandme:
Welcome to Apple Discussions.
It is difficult to tell what is happened to the OS. I would begin with Repair Disk
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel, and report if it says anything but Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
If DU reports errors it cannot repair you will need to use a utility like Tech Tool Pro or Disk Warrior
To be able to remove the update you will need to completely erase the drive and reinstall. Hopefully you have a backup. If the backup is a bootable clone you can simply reclone to the HDD.
cornelius

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