You can find a button in the bottom left corner that says "Fn". Hold that button while pressing those function keys to use those functions....
on the laptop it is left fn next to alt in red and computer not sure
just press the numlook then you can use fn keys
Try pressing the 'Number Lock' key once to turn if off and see if it helps. Tapping the 'Fn' key five times may also work, however the first option worked for me.