Athlon 64 drivers and utilities can be found here
Being an OEM laptop, there is no guaruntee of a temperature sensor being there. You can try Speedfan for monitoring temperatures, or use the bios if it is available there. In the bios, Cool and Quiet can be enabled or disabled. Cool and Quiet can change the speed of the processor up to 30 times in 1 second, so power conservation should already be at best, unless you are doing a processor intensive task properly (games for example).
Power scheming can be changed through Windows.
Right click the desktop > Properties > Screensaver tab > Power
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