Uninstalled Xbox app via Powershell, cannot reinstall

I originally posted this in Microsoft's Windows 10 forum.  After going back and forth with them, they have referred me here.

I recently changed my Microsoft password.  Doing so caused the Xbox app to have an aneurysm; it gave me the Sign in and Cancel (?) buttons, then immediately presented me with a Microsoft login form, without clicking on the Sign In button.  I entered my credentials, only to have it then present me with the two buttons again (which were just sitting behind the login screen, apparently).  So, I clicked Sign In, and entered my credentials again.  Crash to desktop.  Open the app again.  Immediate crash to desktop.  Restart computer, open app - immediate crash to desktop.

I then uninstalled the app via Powershell with

Get-AppxPackage *xboxapp* | Remove-AppxPackage

and this is where I am.  I cannot use the all-encompassing reinstall line

Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

because it gives me an error about Cortana needing to be closed (even after a fresh restart, and manually enabling and disabling it; the error is further down this post).  I found another thread with these instructions from a Microsoft Forum Moderator concerning this Cortana/Powershell issue, but it didn't help (http://answers.microsoft.com/en-us/windows/forum/windows_10-win_cortana/cortana-does-not-work/5a8aff47-3f56-4f3a-a379-4629864f76ca?auth=1):

Please follow the steps and check if it helps:

1. Open an Administrator CMD window.  If you can’t find a way, use these steps:
   1. Press CTRL+Shift+ESC to open Task Manager.
   2. Click File > Run New Task
   3. Make sure you have a check mark beside “Create this task with administrative privileges”
   4. Type CMD

Type the following commands at the CMD prompt:
    dism /online /cleanup-image /restorehealth

 

1. If the above command both completed and show no remaining issues, run these commands:
   powershell
   Get-AppXPackage -AllUsers |Where-Object {$_.InstallLocation -like "*SystemApps*"} | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

The DISM command runs fine.  The powershell command results in the same error:

Add-AppxPackage : Deployment failed with HRESULT: 0x80073D02, The package could not be installed because resources it
modifies are currently in use.
error 0x80004004: Unable to install because the following apps need to be closed
Microsoft.Windows.Cortana_cw5n1h2txyewy!CortanaUI.

Using the command to install an individual app with the install location either doesn't work, or the app I want is not the "Xbox companion" app (in which case, I don't know what app it could be; it's not the Smartglass app, that one works fine).  The command runs without an error, but nothing changes; the app is not in my list of programs/"All apps".

I also attempted to use the reinstall-preinstalledApps.ps1 script as detailed on Microsoft's site (https://msdn.microsoft.com/en-us/library/windows/hardware/mt185364%28v=vs.85%29.aspx), but that process did not solve my problem, as I get a string of these errors when running the script with no arguments (one for each app it attempts):

Add-AppxPackage : Cannot find path 'C:\Program
Files\WindowsApps\Microsoft.XboxApp_2015.1117.445.0_neutral_~_8wekyb3d8bbwe\AppxMetadata\AppxBundleManifest.xml'
because it does not exist.
At C:\users\lou\desktop\reinstall-preinstalledApps.ps1:35 char:2
+     Add-AppxPackage -register $PackagePath -DisableDevelopmentMode
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Program File...dleManifest.xml:String) [Add-AppxPackage], ItemNotFou
   ndException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.Windows.Appx.PackageManager.Commands.AddAppxPackageCommand

Help, please.  I'd like my Xbox app back.

===================================

http://answers.microsoft.com/en-us/windows/forum/windows_10-update/uninstalled-xbox-app-via-powershell-cannot/f0f77a27-338e-4dae-aa16-bcaae798af33

That was the original post.  Attempted/unsuccessful solutions, per moderator instruction:

1.  Running this command at a prompt: "powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.xml"

2.  Creating a new user account to look for the app (it wasn't there, either)

3.  Running sfc /scannow (didn't find any violations)