I Can't change the Displal Brightness in my Probook430

Hello.
I've recently bought an HP Probook430 and installed Windows 7 Ultimate 32bit and I don't seem to be able to change the display brightness, using the fn button+f9/f10 (although volume settings are changed in the same method smoothly).
Although the brightness settings don't seem to change, this bar does appear when pressing fn+f9/f10.
What should I do in order to make the display brightness settings changable?
Thank you!
This question was solved.
View Solution.

You're very welcome.
It was not a silly question at all.
Glad that installing the graphics driver took care of the issue.

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