My computer will randomly shut down.

Hello. I am using a 2006 model macbook pro, running 10.6.8 OS X. My Computer will randomly shut down with no prompt or closing any programs, as if someone held down the power button. When i go to the console application and look under system.log the last message i recieve before my computer shuts down is this:
Dec  8 22:10:44 kieran-hooks-computer [0x0-0x16016].com.apple.appstore[170]: This isn't a bitmap context. Forcing destination format to ARGB_8 for CGContext.
this message is repeated over 15 times in a few seconds. I know quite a bit about computers so dont be afraid to get technical.
please help,
               -Kieran Hook

I know that it only does this when I do something computer intensive. And also the fans run 6000rpm constantly from startup.

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