Computer lags when left idle.

Like the title says my computer has this problems that when it is left idle like if I was watching a movie or something of this sorts, it does this massive lag, sound skips and screen image slows down.

Although right when I move my mouse, the screen goes black for half a sec and resumes to its normal speed. This happens every 5mins or so and some times it wont only lag butactually freeze my computer.

I am running on windows 7 64-bit. I have 3 monitors attached to my computer so I was wondering if maybe my cpu is being over worked and goes on like a power save mode when I'm not moving the mouse or something.

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