Help needed, possible problem with HDD

In the last few weeks, my iMac has become quite slow and tends to freeze fairly often. The other day I turned it on and was met with a kernel panic screen and could not access my desktop or any of my files. To find the source of the problem I ran an Apple Hardware Test which gave me the following error:
4HDD/11/40000004:SATA (0,0)
After searching on the internet, I decided to boot from my OSX install disc and run Disk Utility. After verifying the disc, and repairing the disc, the scan revealed that there was no problem with the HDD. However, I was still being met with the kernel panic screen whenever I tried to turn on the computer.
After booting from the install disc again, I did an Archive and Install, which finally let me get to my desktop, however the computer was once again running slowly and after another Apple Hardware Test it resulted in the same error as above.
After more searching on the internet, I decided to remove the 3rd party RAM from my iMac and replace it with the original RAM. No success again.
More searching brought Disk Warrior to my attention. After purchasing the program, I ran the included scans and once again was given the result that there was nothing wrong with the HDD.
After this I decided to run Tech Tools Deluxe which came up with a Directory fail, even though the Disk Utility and Disk Warrior scans found no such problem.
So what procedure can I take now, I am hesitant to perform a System Restore as I do not want to lose my files, but this may be my only option.
Please help.

Okay, I ended up installing OSX to my external HD and booted from that. Ran Disk Warrior from the external and used it to rebuild the internal HD. After the rebuild DW gave me the message that it could not replace the new directory with the old directory as there was a disk malfunction. I managed to copy all of my important data to the external.
I'm guessing that the internal needs to be replaced? I'd rather start fresh with a new one than risk this happening again anyways.
In any case thank you very much for your help, it was much appreciated .

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Well, it seems that the cause was indeed an empty java file...
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Message was edited by: jenderbender
Message was edited by: jenderbender

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Hey all,
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====================
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Hello everyone,
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Attachments:
test.vi ‏123 KB
Read Tiu Server.vi ‏15 KB

Hi ,
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