Freezing randomly

Ok this is getting extremely frustrating, my computer will randomly freeze. some times it wont occur at all then other times i cant get it to stablize for more then 2 minutes.

CPU:I7 core extreme3.2 ghz
GPU:Nvidia 295
MOBO:MSI eclipse sli
ram:2x3 patriot trichannel ddr3

got the latest graphics drivers and such....7100 is the release number.

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