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After you install a Windows Vista service pack, you may experience one or more of the following problems with sound:
No sound is produced when you play audio files or run programs that have an audio component.
The speaker symbol next to the clock in the notification area may display the following message:
No Audio Output Device is installed
The Sound Controller in Device Manager displays a yellow exclamation point.
The sound quality changes. For example, if you previously had surround sound, you may now have stereo sound.

 

After you install a Windows Vista service pack, you may experience one or more of the following problems with sound:

 

  • No sound is produced when you play audio files or run programs that have an audio component.
  • The speaker symbol next to the clock in the notification area may display the following message:No Audio Output Device is installed
  • The Sound Controller in Device Manager displays a yellow exclamation point.The sound quality changes. For example, if you previously had surround sound, you may now have stereo sound.
To fix these problems automatically, click the Fix this problem button or link. Then click Run now in the Automated Troubleshooting Services page and follow the steps in this wizard.
This article is based on a Microsoft KB 948481 or more information please visit the below given link

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