Sometimes, the problem might simply be coming up from your Num Lock keys. There are many who believe that laptops do not have any Num Lock key but they are wrong.
Getting it turned off is simple. Start by powering the laptop. While getting to the Logon Windows screen, press the Fn + Num Lock button and get the laptop turned off by pressing the power button.
Congrats, you are done! The next time you turn your PC on, the num lock will be off and you will no more experiencing this trouble.