Mr_Venbeer :
You have to disable Num Lock. There should be a Num-Lock button somewhere in your keyboard.
JESUS CHRISTUS! YOU ARE MY SAVIOR. I DON'T KNOW HOW TO THANK YOU. I HAD THIS PROBLEM TOO, SO I THOUGHT I HAD DEADLY VIRUS, BUT I JUST PRESSED NUM KEY AND IT FIXED BY ITSELF, IF I pressed it back it came back. Thank you! FINALLY I know what is causing this issue. One less problem to worry about in my life.