Sometime, sysprep operation may fail with the following error message:System Preparation Tool 3.14 A fatal error occurred while trying to sysprep the machine
Details can be found on Microsoft web site https://support.microsoft.com/en-us/kb/2769827
The quick fix is available here
In run as administrator PowerShell
Get-AppxPackage -AllUser | Format-List PackageFullName
Copy the result in new text file.
in the result, replace "PackageFullName:" with "Remove-AppxPackage -Package"
Copy the edited rows and paste in power shell window
check is there any apps left