Reducing brightness in bootcamp on Windows 7 to save battery

Im running a 2010 Macbook and the only way I have been able to adjust the brightness in bootcamp on Windows 7 is manually:
Control Panel > Harware & Sound > Adjust Screen Resolution > Advanced Settings > GeoForce 9400M Tab > Start the NVIDIA control panel > Drag all of the sliders for brightness and gamma etc to the left.
This is the only way I have been able to adjust the screen brigthness so as to save on battery.
There has to be a driver somewhere that you can download as this is so annoying!
Does anyone know how to improve on this method?
Steve T.

you have to install Cirrus audio driver - Apple doesn't provide one.

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Reducing brightness in bootcamp on Windows 7 to save battery

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