Need help with fps

I just got a new asus g60vx and only get around 15-35 fps with gamebooster.

Specs: Intel core 2 duo p7450 @ 2.13 Ghz, 4 gb ram, x64 bit, 1 gb dedicated memory for Geforce GTX 260M, Windows 7

I've tried different compatibility modes, searched for newer drivers, and was unable to change the priority level of crossfire.exe in the task manager.

Why is it that I can play modern warfare 2 fine on high settings but only get an average of 25 fps on crossfire with gamebooster? Any suggestions?

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