My iMac freezes up, Snow Leopard Intel-based dual-core

Hello everyone,
My first posting here, unfortunately not a happy one. I have a 2006 iMac, with a built in camera, 320GB 2GB RAM and Snow Leopard installed. No windows bootcamp installed.
For the last few weeks I've been noticing the computer getting slower and slower. Last night I ran the Disk utility and found there were some issues with the hard disk. I next ran the disk utility from the Installation DVD and fixed the errors, and subsequently ran disk utility again only to get a notification back there were no further issuese with the hard drive.
The new problem now, is the computer takes over five minutes to reboot (stays on the white screen after coming on all this time) and once up is slowly becomes completely unresponsive. The screen has horizontal lines across it and after a few minutes it is as if nothing is happening on it. I can still move the mouse, but clicking the mouse does nothing, and even after leaving it like that overnight I was unable to get any response from the computer.
I was hoping some of you might be able to help me out here.
Thanks in advance!
-- Kunal

Ok, so it has been a few weeks since this fix. Problem is, the problem keeps resurfacing every so often. And by every so often I mean every two-three days.
Fine, not a big bother. Until two days ago, where nothing I do is helping anymore. The computer starts up, and within seconds everything is frozen. I have maybe a 2 minute window in which I can do something, and then the computer starts slowing down. Another ten minutes, in which I can maybe (if I am pushing it) get one email out, and then the screen is frozen. Nothing I do works.
Any suggestions?

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