Shutdown. Let it cool for a few minutes. Open your tower, clean dust out. 
And I mean *clean* dust out. Open your power unit, (yes, open your power 
unit) and clean the dust out of that too. Open your fan covers, and clean 
the grime off the blades of the fan/s. Pull your graphics card out, and with 
a small screwdriver, (or similar), get as much grime off the fan blades as 
possible. (Hard to get in there if it's a sealed unit, but you've got to do 
it - be careful).

  I did exactly this the other day. You should have seen the crap in mine! 
Get a hoover in there to mop up. Be careful of the wires.  ;)

   If you don't do what I said, bye-bye graphics card. Hello new one. 
Seriously. I learnt this a long time ago.

    Edit: Oh, you're using a laptop aren't you? That must suck with dust in 
one of those. :o/

   ~Steve~

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