Desktop Resets when Apple Menu is Selected

I have a client that was running 10.2.3 before this error appeared on an iMac DV. Once the Apple Menu is selected the desktop flashes and appears to reset. Files on the desktop or in the directories cannot not be moved or copied. Accessing folders/files is limited to view only and any attempt to open them usually results in the same flash/reset of the desktop.
The error appeared after large volumes of songs were downloaded and transferred between others.
Norton SystemWorks was used to verify and repair any disk errors booting in the emergency mode. Major errors were found but all were repaired. Apple menu error was not fixed with this action.
System Preferences will not load.
I have tried to run software restore to rebuild the system files. I had to roll back to 10.2.1 as this was the only system software that I had access to on DVD. Even with rolling back the OS the Apple Menu error remained and the computer would not respond to file/folder access appropriately.
I would really like to preserve the data on this computer - I was unable to check hard drive status before I left the site so I am unsure of how much memory is available.
Suggestions on how I might proceed? Am I looking at wiping this drive and starting fresh?

Hi tfconsult!
Sorry you are having trouble.
Tom is correct in suggesting that removing the Norton utilities, should be your first step in resolving your problems.
You will find uninstallers & instructions at these sites.
Uninstall Norton
Norton Complete Uninstall
Good Luck!
ali b

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