Multiple Errors - G5 Quad/Mac OSX 10.5.8 - After Security Update 2009-006

Question

I'm using a PPC G5 Quad, and after I installed Security Update 2009-006, I began having problems even being able to open project files Final Cut Pro 6. So I had to force quit FCP6, but even that wouldn't close the application.
I figured the issue was probably just with the application, so I manually powered down the computer and only wound up getting two blank blue screens on my monitors when I powered back up.
Powered down again, disconnected power cord for 2 minutes, then powered back up.
Attempted to open FCP6, didn't work, wouldn't quit using "Force Quit."
Opened Motion 3 to create a new project outside of FCP6 - when I selected "Save Project As" the application became unresponsive. Would not quit even when I selected "Force Quit."
To test if there was an issue with other applications besides Final Cut Studio 2, I opened Pages and tried selecting "File->Open." This made the application unresponsive, and would not quit with "Force Quit."
I repeated this test with:
QuickTime Player
Adobe Photoshop CS
Preview
Microsoft Word
Safari
ALL of these applications became unresponsive when I tried using the command "File->Open"
I then decided to try installing Security Update 2009-005 to see if that would help.
Because Safari was locked, I downloaded Security Update 2009-005 using Firefox, then re-downloaded Security Update 2009-006.
After downloading both security updates, I manually powered down the computer, disconnected the power cord for 2 minutes, then re-powered on the computer.
I immediately installed Security Update 2009-005 and restarted the computer.
Once it restarted, I opened up Pages and was successfully able to use the command "File->Open" to open both templates and previously created files.
I then opened FCP6 with no issues, and successfully opened and re-saved an existing project file.
I then re-installed Security Update 2009-006, and re-started the computer according to its prompts.
At first, it appeared that the issues were resolved. I opened Pages and was able to use the command "File->Open" to open an existing template.
I then quit Pages and attempted to open a new Finder window. Immediately I got a spinning rainbow ball and got the message on my screen "System Failure" etc etc, and the last line read something about "Panic" or "System Panic - we're holding here..." or something to that effect. Quite strange.
I'm now in the process of attempting to repair disk permissions using Disk Utility. The permissions that seem to be out of order are with:
private/var/log/secure.log (what and where is this???)
System/Library/CoreServices/Airport Base Station Agent.app/Contents/CodeResources"
various Airport Utilities
Various FrontRow
Various backrow
Several places I don't recognize such as usr/bin and usr/sbin
And internet plugins related to FlashPlayer

Answer 1

How full is the hard drive?