Just bought a 9300 first laptop ever so not really sure about alot of stuff on it- but I see that I can install an upgraded sound card on it somehow, can I just go out and buy a sound card at Wal-mart or somewhere else or does it have to be at Dell? I have an awesome Surround Sound system from my old computer which was THX certifed and would love to hook it up to my new 9300 any help would be appreciated -thanks