My boss' son is having an issue that has me stumped. Regardless of the computer (I've tried 3 different ones), when he logs and to a Windows 8/8.1 computer using his Microsoft account, he no longer has of the keyboard - either the physical one or the virtual one on the screen. When pressing any keys, he gets a "clicking" sound from the computer.
Create a different Microsoft account for him and the issue disappears.
Has anyone heard of this? If so, is there a fix?