Some time on laptops and other devices the scroll lock is stuck and you can not release or disable it or you just do not have this key ! As a result you can not move between cells in excel and the arrows buttons move the hole windows
The simple way is to disable it is through on line keyboard click :
Start > Settings > Ease of Access > Keyboard.
And press on the Scroll Lock to stop it or jus run :
Start-> run -> type: osk