Welcome aboard, john
It sounds like you can't access the built-in apps. Fortunately, there are cures. I would start by re-installing the apps, which is easier than it sounds.
Go to Task Manager--File--Run New Task and type powershell into the box that appears. Beneath that, check the box giving you Administrator Privileges and hit Enter. It takes several seconds for the PowerShell command line to appear. When it does, cut and paste this into the command prompt:
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Remember that you MUST reboot after it's done.