24" iMac Freezes / Reboot / Freezes again...

I have a 24" iMac used to be very very solid but now its freezing almost every other day.
The error is the Grey Screen telling you to reboot. I haven't noticed any correlation between what I'm doing and the errors. Sometimes I'm playing WoW, sometimes the computer is just left alone and when I get back its locked.
The error says to turn off and power back on, I do so and after the white screen I get the blue screen with the Progress Bar and it will give me the same error message there.
I've run Disk Utility and it finds an error, I repair, and reboot and it will boot up fine but its only a matter of a day or days before I have to do the process all over again. This is very annoying and not what I expected from Apple/Mac.
Any suggestions as to keep my computer from causing a disk error, or maybe a way to have the computer automatically fix the disk without me having to boot from CD?
Any help is appreciated.

Hi.
Apparently, your machine is suffering Kernel Panics. You should check your system log, it could provide some information about the incidents.
It may be caused by software or hardware failure or incompatibility.
Have you added third party RAM?
Try booting into Safe Mode and see if it panics.
MacMini G4 1.25GHz 1GB   Mac OS X (10.4.9)  

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