Please run Keyboard troubleshooter on the system by typing Troubleshoot onto [Cortana] search box. The troubleshooter find and fix problems with your computer's keyboard settings.

If Troubleshooter doesn't fix keyboard:

Uninstall / reinstall keyboard driver in device manager. 

1. Right click keyboard driver and select Uninstall

2. Select Action on the Device Manager menu bar

3. On the Action menu, select Scan for hardware changes to reinstall driver

If that doesn't work:

1. Right click keyboard driver

2. Select Properties

3. Select Roll back Driver under the Driver tab

Lastly, if keyboard still doesn't work normally:

Roll system back to the most recent successful configuration of the registry, restart the computer in Safe Mode and select the Last Known Good Configuration option. Hopefully this will finally fix the computer's keyboard.

Thankyou for your reply

I tried all of these but none of them helped me. Even though i reinstalled my windows but the problem is still there.

Do you think that a bios update will fix this? there is a bios update available for my laptop but i haven't update my laptop bios since 2015. And the version of new update bios is A27. Currently i am using A16.

BTW, I am replying to this message by using a USB- keyboard as my laptop keyboard stops working when i logged in now i have to shutdown my laptop and turn it on again then my laptop keyboard will work