Windows 10 update is known to create disruptions in the system and one such problem is the sound issue. If there is no sound after windows 10 update, it means the update broke something. So, there are a few measures that you can try to resolve the problem.

1. First, you can find the broken piece and make it work again. If not, then you can roll back the windows 10 update to make sure that the system is running as it was 3 hours ago. To roll back updates, you can use system restore. System restore will restore the system to a previous autosaved point when everything was working fine.

2. And the second option for you is to reinstall audio drivers on your computer. There are chances that the update broke the system audio drivers and that is why it is not working. So, you need to open the device manager and uninstall the drivers and download the new ones.