I just solved my year long overheating problem with my Clevo D90T (aka Hypersonic EX7), so I registered just to respond to this.
After waiting for the put to cool, you should remove your heat sink (or that see
http/www.timerider.co.uk/laptopcpu.htm for your model) and do 2 things:
a) Get all the dust out of the fan intake grills and the fins of the heat sink.
b) Apply silver conductive grease between the CPU and the heat sink contact surface - enough to just cover most of the top of the CPU. Then replace the sink to the CPU, checking that you have "squished" enough grease on the top of the CPU, but not so much that it goes over the sides. You can probaly get the silver conductive grease at a chain computer store or mouser.com.
Item a) reduces your normal operating fan speed and normal CPU temperature maybe about 5 degrees, depending how clogged you have it. But it does little to help "thermal events" as Microsoft calls them (like video capture).
Item b) is where most of the cooling improvement will come from. My D90T exceeded 79 C on a regular basis with video capture, 3D and DVD burn. It turned itself down for safety from 3.6 GHz to 2.5 GHz (which is like 2 jerky frames per second).
After these 2 little fixes, I cant get it above 72C throwing everything at it and the P4 never has to turn itself down.
Hope that helps,
Russ