If you ever get problems while doing a sysprep on Windows 8 or 10.
1. Unplug network cable or disconnect wifi.
2. Use the powershell command below to cleanup any live-apps, because you cannot sysprep them.
get-appxpackage | remove-appxpackage
Then do a sysprep with or without answer file and it goes thru.
c:windowssystem32sysprepsysprep /generalize /oobe /shutdown