7) Try rolling back the sound drivers in Device Manager reached by right clicking the Start button. Choose Sound controller and other audio devices, then Driver tab, then Roll back if available. If no newer sound drivers then uninstall the one presently installed in Device Manager, reached by right clicking the Start Button. Restart PC to ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.