Hi,
Since yesterday, I have noticed that a number of built in Windows 10 apps have broken.
Photos, Skype, Calculator and Maps have all disappeared completely and only appear in the All apps list under Other and all have weird long names (see picture attached). Clicking on them has no effect, they no longer run at all.
I have tried to uninstall the offending app using the admin PowerShell commands, e.g. Get-AppxPackage *photos* Remove-AppxPackage, but get the message:
'Remove-AppxPackage : Deployment failed with HRESULT: 0x80073CF6, Package could not be registered.
error 0x80070003: Reading manifest from location: AppxManifest.xml failed with error: The system cannot find the path
specified.
.
NOTE: For additional information, look for [ActivityId] f97c8a93-2898-0002-3c20-7df99828d101 in the Event Log or use
the command line Get-AppxLog -ActivityID f97c8a93-2898-0002-3c20-7df99828d101
At line:1 char:28
+ Get-AppxPackage *photos* Remove-AppxPackage
+ ~~~~~~~~~~~~~~~~~~
+ CategoryInfo : WriteError: (Microsoft.Windo...__8wekyb3d8bbwe:String) [Remove-AppxPackage], IOException
+ FullyQualifiedErrorId : DeploymentError,Microsoft.Windows.Appx.PackageManager.Commands.RemoveAppxPackageCommand'

I have tried to reinstall all built in apps using PowerShell using Get-AppxPackage -AllUsers Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)AppXManifest.xml”} , but for each of the broken apps I get the message:
Add-AppxPackage : Deployment failed with HRESULT: 0x80073CF6, Package could not be registered.
Merge Failure : error 0x80070003 : Cannot register the Microsoft.Windows.Photos_15.1120.13270.0_x64__8wekyb3d8bbwe
package because there was a merge failure with the following file: C:Program
FilesWindowsAppsMicrosoft.Windows.Photos_15.1120.13270.0_neutral_split.scale-100_8wekyb3d8bbweresources.pri
NOTE: For additional information, look for [ActivityId] f97c8a93-2898-0002-d1d8-7df99828d101 in the Event Log or use
the command line Get-AppxLog -ActivityID f97c8a93-2898-0002-d1d8-7df99828d101
At line:1 char:37
+ ... s Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.I ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : WriteError: (C:Program File...ppXManifest.xml:String) [Add-AppxPackage], IOException
+ FullyQualifiedErrorId : DeploymentError,Microsoft.Windows.Appx.PackageManager.Commands.AddAppxPackageCommand

I have checked out the relevant event log entry, as the Windows rantings suggest, but I can't make head or tail of it. Please see the second attached picture.
Does anyone have any ideas please?
Hope someone can help!
Thanks
Matt