Vista Keyboard Help…

Hi I Recently Purchased A New Laptop with “the wonderful vista program” anyway it was running surprisingly well until 2 days ago when my keyboard started malfunctioning on me. At 1st i thought it was a virus but my Norton Anti virus doesn’t pick anything up, also its only certain keys that don’t work. I’ve narrowed down the non-working keys (A S D F J K L : ) as you can see its only the middle row that is affected by this. does anyone know what the problem could be? Would buying a new laptop keyboard be able to fix the problem?