Well first you should get a monitoring program like Everest / Coretemp / Realtemp and see wich component is overheating. You can buy an aftermarket cooler for the cpu/gpu or a new case if yours lacks airflow.
I guess , my graphic card is creating the problem..
its of 64 MB only..
or should i try changing d fan....?¿?¿
and YES... at the moment that it turns off... a foul smell of something burning comes..... nd it vanishes... evrytime