Recently bought a Dell Latitude D510 laptop, upgrade the machine recently from windows vista to windows 7. And after that there is problem occurred in my laptop, this is not properly giving me the sound. This occurred while I was played a audio file in my machine yesterday. This plays up to the first 10 minute and suddenly stops the sound. This happens first time in my machine. How to recover this, any idea on this problem? I am using Realtek sound driver, which installed after the upgrade my laptop. Any information regarding this will be appreciated greatly. Along with that there is another, which I am facing is that, I need to close the player from task manager and this one should not play next time. I need to reboot the machine, otherwise it will not responds. Suggest me something to solve this issue.