In order to fix the issue, right-click the Sound icon from System Tray and select Playback devices. Right-click anywhere in the provided window and check the Show Disabled Devices option. After that, select your speaker device and click the Properties button. Set Use this device (Enable) as device usage, click OK, select the device again and press the Set Default button. If it doesn't help, go to Start, type dxdiag and open the utility. Click the Sound tab, check your audio card model and download and install the latest drivers available from the developer's page. If you still have issues, uninstall and reinstall the software.
