I need an advise, when I turn-on my laptop, it will start overheating them it will shut down. The laptop will start sounding as if I am stepping on a car accelerator, them it will shut down. Can someone help me fix this situation.

Assuming it's an overheating problem...take a can of compressed air, and try to blow and dust out of the vents, especially the fans.

Which laptop model?
Which OS?

Take it to a technician/service center and get it serviced...

ITs an emachine with Windows XP (Home Edition)

It's probably your CPU ventilation clogged with dust. Many machines have user-serviceable fans. For example my Dell has a little Philips screw which, if you take it out, allows the CPU fan housing to slide out, and makes it possible to clean it. First time I did that my average CPU temperature dropped from 80C to 37C!

Check the documentation which came with your laptop, or look on the manufacturers website. Dell are excellent for this - you can download the technicians handbooks which describe with excellent diagrams how to disassemble machines. Way cool. See here for example.