Go to "Control Panel" and then to "Device Manager". In there locate "Keyboard" and open it. It should show you your keyboard below that. Open it and then click on the "Driver" tab. Click "Uninstall" to remove the driver and follow the prompts.
Now before you reinstall it, you should reboot (turn off and back on) the laptop. The computer should then reinstall the correct driver on its own when the systems boots back up.