just as i thought & that would explain it all.your sound chip not being detected. ok,please go to Start > Help & support.under Pick a Task,select keep your computer up-to-date with Windows Update. Download all that it tells you to download (updates) & install. after installing all the updates,Run the driver CMI8738_WDM_0639XP & dont forget the basic things before you proceed in istalling the driver."8738 in Motherboard".if thats the default then leave things unchanged.