Can't adjust the brightness of my hp probook 450 G0 with FN+ f9 and f8

i have hp probook 450 G0 and i am finding the solution to adjust the brightness of my laptop by using F keys...i have installed all the drivers of my latop and i am using win 8.1 32-bit ..plz help..urgennt solution...before this i was using win 8.1 64 bit but this option worked...so plz help

Hi:
Make sure under the display adapters category that you see the name(s) and model number(s) of the graphics adapters listed there.
If you see a graphics device labeled Microsoft Basic Display Adapter, the applicable graphics driver was not installed.
You also need to install the Intel chipset installation utility and reboot before installing the graphics driver.
Not having the chipset and graphics drivers installed are the most likely reasons you cannot adjust the screen brighness (it is stuck on maximum).

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