Sound distortion/cracking/echo/choppy in game

[soldier000]

I just recently used system recover (restore to factory condition) i have used it a couple of times and never had this peoblem but now when i play Left 4 Dead 2 and other games there are some kind of distortion cracking/echo/choppy sound at certain times. I have the latest audio realtek hd drivers 2.52 anyone know whats going on? its really anoying because i cant hear the game sound properly just whack distortion. it sounds like the distortion on certain computers when you use flash player in full screen with hardware accerlation on with non compatable hardware + a bit of echo. i have tryed to look for the sound hardware accerlation in sound but i couldent find it in vista.

i am running on a onboard card not sure what it is

Vista 64

before i restored my computer everything was working fine and i have tryed contacting Hp live soupport but all they said was unplug and plug the cord back in and my computer is broken and i should send it in for them to fix... but i dont want to send it in