You can try re-installing the photo app from powershell.
Get-AppxPackage *Photo* | Add-AppxPackage "$($_.InstallLocation)\AppxManifest.xml" -DisableDevelopmentMode -Register
You may need to rename the following directory, but I'd try re-adding without renaming it first.
"C:\Users\<username>\AppData\Local\Packages\Microsoft.Windows.Photos_8wekyb3d8bbwe"