"Keyboard settings section in "control panel". It seams that the keyboard(s) have taken on or have been programed by mistake from a program.
The other way of a quick fix is to go into the "device manager" (Start > settings > control panel > system > device manager) and right click on your keyboard and select "delete", when it is deleted reboot your computer. You will not be able to use your keyboard until it is re-installed by your computer, so just let it bootup and you will see a box coming up that says something like "found new hardware" or "found new keyboard", after this you should be able to use as normal."