clipped from: www.microsoft.com Dust clogs the vents behind your computer, which causes your CPU to heat up—and heat is the biggest cause of component failure in computers. Regular cleaning could save you costly maintenance fees down the road.
You'll need:
screwdriver
can of compressed air (available from computer dealers or office-supply stores)
cotton swabs (do not use a cotton ball)
rubbing alcohol
paper towels or anti-static cloths
water
Always turn your computer off before you begin and unplug all the cords.