Carl recently updated to Windows 21H11, and it killed his sound. Leo says that there is a known issue with sound problems on the latest Windows update. If you delete the sound driver, reboot the machine, then reinstall the driver, that may solve the problem. Here's a link on HowtoFixWindows.com that could solve it. It has about 20 things to try. There's also a Microsoft tech note that you can try here. It may also be due to your hardware driver being out of date, and you need to wait for a new driver. And the solution may be to get a cheap sound card and install it.