[jims69camaro]

see if you can put little filters over the fan openings that suck air into the case. that will help with the dust issue. also, crack the case every six months to make sure it's clean inside. if you don't have access to pressurized air, you can buy a spray can "air in a can" or something like that... it's in the aisle with the rest of the computer's ancillary needs (cables, power strips, etc.) and sometimes all you need is a little blast of air to dislodge the dust resting on boards or on the heat sink and on the fan blades. don't skimp when it comes time to clean. you can buy make-up brushes that will help with the chore, as well. nice and soft and they won't dislodge components, like memory sticks, but they will help getting into the crevices.