So, how did you manage to type "n" and "b" in that message?
Either your keyboard has been remapped or something, (a game, perhaps) is intercepting the keystrokes.
Some laptops have a coloured key that remaps certain keys to allow you to easily perform other tasks. Are there any other (coloured) clues on those particular keys?;
Or, assuming that you are using Win XP, check under Control Panel/Regional and Language that your world is set to the UK and that the Code Page is set to 10000 Roman as a minimum (other code pages are usually selected but you will have to research those).