I have sound in all other areas of the computer, but when it comes to doulingo it just stopped working yesterday. I have tried all of the suggestions you offered, but none of them worked. My neighbors have been hacking my computer and stealing all of my passwords so that they have access to anything of mine that they want and I just do not know what to do anymore. But I think they ruined this as far as the sound goes. How do I get it to work again? Thank you.