This is really annoying me! I recently installed a nlited version of xp home, legit copy. I ad it all up and running fine and the brightness worked. and now its stopped working? I don't have the num lock on. I have reinstalled graphics drivers. Any help? I really want to be able to increase the birghtness, its awfully dull as it is. All other fn keys are working. Yet the brightness keys seem unresponsive and do nothing!