For those of you who encounter the above issue and attempt to use PowerShell to run the Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”} but the process never finishes, check the permissions on these two registry keys: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer and HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders – it should have a user called All Application Packages with read permissions.

In particular, the second one. I had an issue where the Get-AppX command would not complete on a Windows 10 Dell OptiPlex machine. I tried restarting to no avail.

I checked on the first registry key and All Application Packages were listed with read permissions for that key.

I checked the second, and All Application Packages were not there at all. I had to go to Advanced, Select a principal, if you’re on a domain, change the From this location: to the actual computer you’re using. Enter All Application Packages into the object name to select the box and hit OK.

Make sure it has read permission on the second registry key.

I rebooted the machine, and the start menu was working. I was also able to input the user’s Outlook password.