Thanks for replying, I don't think that it will be dirt as it has been happening since i got the laptop. I will clean it anyway. I'm not worried too much if the problem stays anyway as I've gotten used to it. Again thanks for replying :D
When i play games on my laptop, about 10% of the times i press the W , A ,S or D keys and i let go, the laptop/game thinks that i am still holding down the key. Please help.