If you are receiving sound not working error in your Windows PC, then first check Settings -System -Sound and make sure the correct output device is selected and the volume isn’t muted. Then run Settings -System -Troubleshoot -Other troubleshooters -Audio -Run. If that doesn’t fix it, update or reinstall the audio driver through Device Manager -Sound, video and game controllers. Also check that your speakers/headphones are properly connected and test another output device to rule out a hardware problem.