This is the first thing you should do and even if Windows Update is set to automatic, it is worth manually running it.

Here are the steps I took to fix the problem. I fixed it eventually, but there were some scary moments along the way. What is the solution? Many other people that have had this problem have tried all sorts of fixes, few of which were successful. The only apps that would work were ones that did not produce any sound. Videos would not play because the audio stuttered so badly and games would stutter and stop too, because they played music and sound effects. In fact, it was so bad it affected games and videos that had sound in them. In my case I got buzzes and clicks and nothing else from apps. Yet when apps from the Windows Store run, they do not play the sound. This must surely mean that the audio hardware and the audio drivers are working properly. Other desktop applications also play sounds just fine.

This is a strange problem and when using a browser to watch YouTube videos for example, the movies play fine and the audio is loud and clear. Are you having problems with audio in Windows 10? A weird problem sometimes occurs where audio plays in desktop programs, but no sound is heard in apps from the Windows Store.