Keyboard, and even on-screen keyboard, are not working!

I started working on my laptop today and was annoyed when I tried to press shift it would page down on the document I was working on. Then the letters I was typing were incorrect on the screen. I backspaced a couple of them and then it started to delete what was written in front of it. I tried to restart my laptop and then when I would type any letter or number it would be immediately deleted. And now all the buttons aren't working at all. I thought using the on-screen keyboard would help but it's acting the same way.

Can anyone help me?