thanks for the replies.
actually the computer was owned by my friend. I installed 2 antivirus softwares on the computer, Avira and Avast. I got an error message after I installed avast.
Here's the real problem, the computer boots then after 1 or 2 minutes, the cpu shuts down and can't be booted again.
Is the probelm with the software only or with the hardware also.
My friend said that it was exposed to direct sunlight.
Any possible solution please..