Is there a known issue of computers losing audio after upgrading from Windows XP to Windows 7?

Windows 7 has a new Volume Mixer feature & Volume Control options. The key improvements to this feature are is the ability to control the individual sound levels of each application which calls for audio support from Windows 7. Use use it, open a media file to launch the associated player, then click on the speaker icon on the right side of the taskbar.

Next click on Mixer to open the Volume Control window. Your will see a slider for the application that is playing the media file. Adjust the slider for that application.

You should try updating or reinstalling the sound driver. Check if there is a Windows 7 compliant version on its website.

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