Can't change laptop screen brightness on windows 8

I am using dell inspiron 17 R special edition. It came with windows 8. 
I have been using it for 3 months. Today I started my laptop and i wanted to change my screen brightness but nothing is happening.
Brightness buttons are also not working not even from the settings menu.
Its the same with or without connecting power adapter.
Please help soon.
Answer
Answer

Hello I also face same problem with my sony vaio laptop, but I update my ".NET framework" and the problem was gone.

here the step to upload .NET framework in WINDOWS 8

1 control panel

2 action centre

3 check windows update setting in security panel whether it is on or off (FIND windows update setting)

4 if it is off then turn it on 

5 press windows update in lower left corner of screen

6 view available updates for windows

7 install .NET framework update 

If you find it difficult you can download .net from website, but I am not sure that will work or not.

THANK you..

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Answer
Answer

Had the same problem on my HP Envy 15 360x. Fixed by downloading KB updates. Link provided below:

http://www.microsoft.com/en-us/download/details.aspx?id=43258

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Last updated October 10, 2020 Views 52,994 Applies to: