I am using Windows 10 and Microsoft Excel 2013. My left and right arrows both function appropriately. However, when I use my up and down arrows nothing happens. I have tried this on two separate key boards so it is not the key board malfunctioning. I have already tried turning the Scroll Lock on and off as well as going to the on screen key board and turning scroll lock on and off there. I have also turned my sticky keys on and off. Please let me!