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Audio problems in Windows Vista and Windows 7 could arise because of so many small reasons, that you’ll need to systematically eliminate all possibilities including the basic device connections. Also check if the volume controls are adjusted accordingly especially while working on a laptop with inbuilt speakers, whose volume can be controlled using many options. If you have multiple audio devices connected to your system, remember to set a default playback device in the Sound options. In case the device fails to list in the playback tab, once again check if the soundcard driver is updated. If all these resolution techniques still do not help, resort to Windows 7 Support forums or websites for any other specific fixes.