Good audio software is very important for any system. Several users reported that they could not open Realtek HD audio on their device. If you are facing this issue, then don’t worry, this is not a specific issue. It is one of the common issues of the Windows 10 operating system.
Please read the originial post here: https://my-blog-search.com/how-to-fix-realtek-hd-audio-manager-wont-open-or-not-working/