webworkings :
So you are saying you installed it, rebooted without reinstalling and then it reinstalled on its own and still not working?
Have you checked to make sure it is using the correct layout? I mean for the correct language. Like if you are wanting it to be for UK but it is running US or vice versa. You can use the following info to check on that and install the right one for you if needed.
In Windows 10...
To add a keyboard language...
1. Click the "Start Start" menu and select "Settings".
2. Select "Time & language".
3. Click "Region & language" in the left column.
4. Select "Add a language".
5. Choose the language you want to add and select a country for the language.
To set a default keyboard layout...
1. Click the "Start Start" menu and select "Settings".
2. Select "Time & language".
3. Click "Region & language" in the left column.
4. Under "Languages" click the language you want as default and click "Set as default".
To switch keyboard layouts...
Option 1...
1. Click the "language name" in the lower right of the screen (taskbar).
2. Select the keyboard layout you want to use.
Option 2...
Press and hold the "Windows" key while you press the "Space bar" to change the language.
Thanks for your reply but not sure this would fix my problem. I am not having trouble changing input language but my "function keys" that controls brightness, volume, mute/unmute, wifi on/off, external display selector, etc. at the top of the laptop keyboard stopped functioning. I also found that my FN+Space bar(Zoom) is not working either. I'm guessing the reinstall of windows 10 messed up my keyboard driver.
As I said before I tried uninstalling the keyboard driver and restarting the computer to "reinstall" the driver but it did not fix my problem.