MBP Overheating, but its no + Also SLOW. Need Urgant Help Please!

My MBP is having some problems. The MacBook's fan has been going like mad (at full speed I would say), and the speed of the MacBook is just unusable. It is literally laggy to move the mouse around.
What I have done and observed.
Tried checking the temp, to see if the Macbook was hot, it was (have included a pic below).
Formatted the HDD, obviously hasn't worked, the installation has been running for three hours and because the MBP is running so slow, you can imagine. The Macbook does not even feel warm, nor does the air coming out of the back of it.
The fan stopped going mad for a little while.
When the fan stops going loud (full speed) the computer goes back to its fast speeds.
When the MB is going slow and the fan is at full speed kernal_utility is using around 170% of the CPU usage.
The picture of the temps: http://img251.imageshack.us/img251/3193/photombr.jpg
Anyway I need some major help, I have been using it for my year 12 notes and I do not have time to take it into Apple ATM, so anyway, does anybody have any idea's on how this could be fixed?
Cheers

The "-128°C" reading for your left palmrest temperature sensor is cause for concern, since it's obviously completely wrong. If that sensor is malfunctioning (constantly or just intermittently), it may be triggering strange fan behavior and other malfunctions.
Run the extended version of the Apple Hardware Test you'll find on one of the DVDs that came with your machine (whichever one contains it will say so and have brief instructions for running it on the label). I expect it will return an error message containing "SNS", and if it does, take your machine in for repair. If it's still under warranty or extended AppleCare, the repair will be covered.

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