LeanneD

I have a HP Pavilion G6 Laptop, about 6 months old. Recently the sound has become extremely distorted. I use iTunes and the sound seems to be fine but as soon as I open up an internet page, the sound becomes tinny and distorted. The laptop also becomes quite slow, jumpy and jittery. the same is with any videos that I try to play, they skip and jump and the sound is extremely distorted. I have ran anti-virus programs and they have come back as 100% clean. I have cleared the laptop of all unnecessary junk and ran clean-up programs. I've also updated all software. I've looked on many different forums on the internet and followed advice given to other users with a similar problem. Nothing has worked so far. Any help would be greatly appreciated. Thankyou