Enabling brightness controls on my Asus laptop

Hi everyone,

I have Windows XP Pro 32 bit working perfectly on my Asus K55A laptop. The only thing that isn't working is the brightness controls. All the other controls using the Fn keys (volume, wireless switch, sleep, etc.) work fine. Normally I'd ignore this issue only that the display is just a small bit too dim for me and I'd like to increase the brightness one way or another. So if anyone knows how to enable the brightness Fn keys on this laptop or knows another way to increase the brightness I'd love to hear your suggestion.

Thanks!