Function keys to increase brightness don't work

I have a MacBook Air purchased in 2014 - I have just noticed that the function keys F1 and F2 do not work, nor does F5 and F6 - I am trying to increase brightness... I have tried Function keys, Option, Command and Control - nothing works. I have a fully updated system. i can't recall this happening before - is it a bug? Any assistance is appreciated.
I went here - but while it's a great list, it did not provide help to solve the problem - http://guides.macrumors.com/Keyboard_shortcuts
Randy

Try resetting the SMC Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support

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This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is localized to your user account, or is system-wide. Enable guest logins and log in as Guest. For instructions, launch the System Preferences application, select “Help” from the menu bar, and enter “Set up a guest account” (without the quotes) in the search box.
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Moderator Note; subject edited; post moved here to start new thread

hi bharath666,
Welcome to Lenovo Community Forums!
Were you able to install all the drivers and Software After the New installation of Win 8.1?
Get the drivers here
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This is a repost of an older thread, however i am having the same exact problem and i know i am not the only one.
Origionally posted by FIDO2010 -
"Problem: The keyboard function keys (i.e. screen brightness, audio volume etc.) and backlight no longer work in Windows 7 (64-Bit) running Boot Camp 3.x. I also had the identical problem with Windows Vista (64-Bit) running Boot Camp 2.1.
Oddity: When I first installed Windows 7 and Boot Camp 3.x (same with Vista and Boot Camp 2.1), the keyboard and backlighting worked perfectly for about 3 Shut-Down/Re-Starts.
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Solutions?"
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As you all are probably well aware, this exact problem has been asked on a countless number of discussion boards and each is answered with a different "solution." Quotation marks are necessary because the solutions suggested work for some users but don't work for others. So, in a way, I offer those who read this reply this same disclaimer. The following solution worked for me (for now!) but it may not work for you.
Just like those other users, my volume and brightness function keys on my Macbook refused to work after installing the latest Bootcamp updates and after restarting Windows 'x' amount of times. In addition, trackpad scrolling, which worked great after one of the updates, also did not respond.
Here's what I did to get them working again, and it's rather simple. Find the Bootcamp application in Windows. Mine was housed in Program Files but yours may located be somewhere differently. Right-click the application and select Open. In my case the screen went black and the resolution downgraded to 800x600 or lower when the images on the screen returned so keep this in mind if or when you attempt this. The screen is significantly cropped so you may have trouble navigating to the Control Panel to fix the resolution to your liking. Anyway, now my brightness and volume function keys and trackpad scrolling work properly.
I should mention one or two more bits of information before I sign off. To start, I cannot say if this trick continues working after restarting Windows. Also, I do not know if this process is something you have to perform everytime you run Windows. In any case, let the world know if this or any other solution fixes this stated problem for you.

Function keys to increase brightness don't work

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