Quargar 0 Newbie Poster

Hey, my hp dv9500 laptop was bought with a core2duo processor running at 1.88GHZ. I treated it rather rough, and my room is really dusty, and the fan got very dusty, and to case would get really hot at times. one day, the control panel said the processor was running at 1.66GHZ, not 1.88, like it used to. can i just buy a new processor for it? i know it's upgradable, but is the issue just a semi-fried processor, or something w/ the mobo?