I cannot install, or export using Pacifist error -60008

[Iconic Drei]

I cannot install anything, therefore I tried to use Pacifist but whenever I try to export anything I get the error -60008. I also get this same error number when I tried to remove something from my applications.
I cannot even create a new user account to see if the problem persists there. It is all grayed out.

Also, whenever I move my cache to trash I get the error: The operation cannot be completed because the following error occurred -60008

I'm using Mac OS X 10.6
I also do not have Installer.app only the Adobe Installer. I have no idea how this may have been deleted though.

When I go to repair disk permissions using disk utility I get this one message:
Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" has been modified and will not be repaired. I suspect this is the problem, how can I sort it out?

 

[DeltaMac]

Your Installer app does not live in your Applications, or the Utilities folder.
You can find it in your /System/Library/CoreServices folder.

Try running your hardware test. You can restart, while holding the letter "D". Your Mac will boot to the built-in diagnostics test. Run the extended test.
Come back here with any error codes that are produced.