I have a compaq MV520 w/ built-in MIC and am using windows xp......it doest work when i record on sound recorder.....when i got to volume adjustment......i can adjust volume but balance bar is greyed out........also in control panel, under sounds and audio devices, under sound recording, the advanced for mic is greyed out , but it says that the default device is VIA Audio.........using asus a7v133 with audio '97 integrated sound card............do i need a driver?