hi, you may need to change your Heat-sink and fan but, it's hard to say.
check to make sure your fan is working.
in the mean time.. herehttp://www.mytechopinion.com/2008/10/so ... oesnt.html
The Link I gave you is good for summer so if things do start heating up, your Laptop will be ok or should be.
this link will help your Laptop from over heating on you or die on you... which ever comes first!
serial Number and Model number would be nice to this way I can get more information about your Laptop.
possibilities of a faulty motherboard, bad memory, bad exhaust for the laptop, or bad heat-sink and battery
Let me know and me or someone else will take the next step to do the Job.