I can reset the Windows Update, but I don't know if attempting to reinstall this update will restore the missing functions (such as the speaker volume). This is what I found in my research:
Open an administrator command window and type the following:
dism /online /add-package /packagepath:C:\Windows\SoftwareDistribution\Download\c4a1b8896ce9fbfea96c1ee6890d52a5\windows10.0-kb3122947-x64.cab
This reset the Windows Update to no longer say it failed, try again. I'm going to bed now. I'll see what it does tomorrow. If it fails, that's why I do the image backups.