Keyboard multiple character issue: printing characters along with numbers

Hi, I have this very serious issue with the keyboard of my laptop (Acer Ac700-1099 with windows xp). when i hit the number keys it also prints the character along with it, like say when i hit 6 it shows 6c, when i hit 9 it shows 9v and so on. I have tried reinstalling the OS too but it Didn't solve the problem. The possible cause is that some one may have dropped liquid on it. Please help me with an economical solution. Thanks in advance.
