I've got a Toshiba Satellite A-665-S6086 and am running Windows 7. I ran into this problem today when I downloaded Realtek's High Def Audio Driver R2.63. When I downloaded the new driver, my previous Realtek HD Audio Manager was gone. The Dolby Advanced Audio enhancement is embedded in that Manager. I did a System restore and rolled back my computer to a restore point before downloading R2.63 and wah-lah -- the Realtek HD Audio Manager is back -- and thus the Dolby Advanced Audio enhancement is back.