Whenever I need sound on my all-in-one HP PC, running under Windows 10, the volume slider shows a very low value, typically between 2 and 4. So I have to keep increasing the volume every time I need sound. I have tried Settings > System > Sound and set the volume to 22. This works until I shut the machine down. However, when I boot up the next day, sound levels have gone right down again. How do I get it to keep the default sound level to 22?