Hi Brother ,
well i mean to say that it error occured while watching a movie on my windows 64bit , and i did all R&D including switching my OS to 32bit windows , and again installed vista drivers (vista drivers are working fine with windows 7 , coz earlier I used to install them ).
Many Hp users are facing the same problem , and i didnt find a universal solution. System information shows no sound device on my laptop. all third party software notify me as no sound device on the laptop.
I need a confront that is it a software issue or a hardware one ?..
I also tried what you said , and hard luck , no resolution !!!