Keys not fnctioning properly on internet

Hello,
my laptop is 3 months old, hp compaq 320GB hard drive, whenever i am on the internet and i type, not all the keys respond, so i have to keep looking out as i am presently doing while sending this mail to re type already typed words that some letters were ommited. wheras, when i am not on the internet package like MS Word, the keys function perfectly. please help. thanks