You cannot write to the Winlogon Registry for the GINA.DLL Key during Full Disk Encryption (FDE) installation.
To resolve this issue, make sure to shut down or stop any type of intrusion prevention software. This is applicable to any type of HBSS or intrusion prevention software that may hinder the MSC files from running. It may also prevent any changes to the registry that may be done with the installation of FDE.