Brightness control keys stop working after booting MacOSX

I bought a new iMac 27" a couple of weeks ago, and I installed Windows 7 using bootcamp.
All the control keys (brightness, volume, etc) works ok on Windows until I reboot it in MacOSX. When i start windows again, brightness controls keys stops working, leaving the screen with the maximus bright, which is killing my eyes.
Reparing boot camp drivers doesn't do the trick. Am I missing something?

Try fn + the controls. It might be that Windows defaulted to those buttons as F1, F2, etc. Using fn while pressing the buttons will 'tell' Windows that it has to listen to the Bootcamp software and lower the brightness.

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