Go to device manger
Select -> Keyboards and select your keyboard driver. Right click and select uninstall. Restart the computer.
See if the keyboard works fine or not.
If the same issue continues then the issue is related with a hardware damage. You will have to replace the Keyboard.
I am having the same problem also. I uninstalled, how do I reinstall?
let me know what happens.
You can also try using an different keyboard.