"I have a possible solution for you. In the Device Manager, under the category "Sound, Video, and Game Controllers" do you see an unknown device or even USB audio device listed? If so, please right-click on the device and select Update Drivers (search automatically). If there were no updates detected, please repeat the process only this time selecting Uninstall. Once your device has been uninstalled please right click the category title and select Scan for Hardware Changes"