keyboard not working properly

[Jakes_]

whenever i type the letter g the number 6 also appears automatically and when i type the letter h number 8 appears also

 

[thejackal85]

It sounds like you have sticky keys/shortcuts on with your keyboard. Depending on your keyboard make/model research sticky keys on it and that should lead you to the answer. Most times its always holding down a SHIFT key until you hear a beep, but it varies.