Dust Bunnies!

Once in a while (before your CPU melts?) you should take the time to UNPLUG THE POWER CABLE, pop open the case on your PC and carefully vacuum the insides taking care not to damage the components. This will, on occasion, require you to unscrew various bits in order to gain access to such things as the CPU. Be not afraid! Go slowly, never force anything and all will end well. If doing this much needed maintenance gives you a fright then have a PC tech do the duty.

A fuzzy PC can easily get hotter then it should with results including possible fire but more likely a fried CPU and/or a stir-fried motherboard. This would be bad ;)