some of the digits of my keyboard have been swaped with others, for instance the @ sign appears right-hand side of the keyboard as it does on any keyboard, but when i try to get it, it does not appear instead this appear " . The @ sign is found by me pressing the shift key and then pushing the 2 number on my keyboard. All the letters A-Z are fine but its the speech marks, @ ect. that are affected. how can i set them back to what they where.