my CPU has 52 C by Default but when I try to overclock my Q6600 in Gigabyte P35-DQ6 (Even 1MHz) my VCore starts to fail and my CPU temp reach 80 C, help me! (I have a 850W cooler master power supply and a Geforce 8600 GT and stock intel fan.)
Well for starters trying to overclock with the stock cooler is generally not reccomended, particularly a quad-core. If you really want to try it, you need to at least get yourself a tube of MX-2 or Arctic Silver 5, remove the heatsink, clean the old thermal paste off, and apply some of the good stuff. There are several guides both here on the forums and on line in general that discuss how to do it if you are unsure.
But your best bet is to get an aftermarket heatsink.