laptop Keyboard typing input output mismatch

Suddenly my laptop (HP Laptop Keyboard ) (windows7) is malfunctioning. The output does not match the actual input i type.



When I type: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ` 1 2 3 4 5 6 7 8 9 0 - = [ ] \ ; ' , . /



i get the output A B DC DC DC GF GF HN M, J M, . M, HN . P Q GF SX T U V SX SX HN Z a 1 sx 3 dc gf hn / - / ] / \; ' m, . / \;



Even enter in HP Laptop Keyboard and backspace \; give me the following outputs: \; \;



Left arrow functions as the tab button.



Use of a external keyboard gives me the correct output so I am not able to understand what is the problem. I tried cleaning the HP Laptop Keyboard and pressing fn+numlock or fn+shift+numlock. This also did not solve the problem.



Thanks for any help you can give.