Brightness on windows xp

I installed windows xp on Dell latitude knees. When I press the function key + up/down arrow to adjust the brightness, the brightness was not adjusted. How can I adjust the brightness?

I hope that this is because the software that associate with the function key is not installed or damaged. You could visit the dell support site and then install the software required for your PC:

http://support.Dell.com/

Tags: Windows

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