I had the same issue.
I could get the desktop again but I had to edit the registry.
Start registry using command regedit.
Go to key: HKEY_Local_Machine\Software\Microsoft\WindowsNT\ CurrentVersion\Winlogon
Now on the right search for ”Shell”
Click double on this and change the value to "explorer.exe"
Close registry and reboot the unit.
Should help to get explorer again.