Underclocking as was said up above will help you then.
I did not know it was a desktop cpu. If its a 3.2 Ghz then a underclock to probably 2.8 Ghz will help loads. A laptop cooler is not designed to wick the heat of a desktop cpu. Another thing one may do is use a Laptop mat with fans in conjunction of underclocking.
Win 8 is salvagable as long as you run Classic Shell to mimic Win 7 or XP's GUI.