I have problem about over heating of my p4 procesor specialy in summers, my motherboard is 775i65G ... in summers the temp. of processor reaches 62 degrees and cpu fan runs on high rpm which results in vibration and accessive sound..

There is no need to worry just clean the heatsink fan and 62 degrees is normal in summer.

Thats fair, well there is not much you can do without the right stuff, u need to buy a new and more advanced cooler, that doesint make sound and its much powerfull, i might wana change your power supply to,,,,and leave the case open, just for summer

All fans in time will get louder. The power supply unit has a fan and if you don't already have a fan on the CPU then you can add one to help cool it The fan in the power supply can be upgraded to a quieter one if need be. Any dust on in the case on on the circuit board will retain heat so getting some dry air and cleaning them should be performed. Be sure to ground yourself to the medal case when working with the case open.