This Knowledgebase article provides information about the "MSDE Writer reports error 0X800423F4" error that may be encountered when installing Neverfail on a SQL Server.
The error "MSDE Writer reports error 0X800423F4" may be encountered while setup performs the backup during the installation of Neverfail Heartbeat.
The error message '0X800423F4' is the result of the the database VSS Writer not allowing the snapshot to be taken because the snapshot will contain the databases in an inconsistent state.
After Neverfail Heartbeat is installed on the Primary server, NTBackup must be run manually selecting the following files and folders to be backed-up:
C:\Documents and Settings
Additionally, a file (either existing or newly created) on every volume in the system must be added in the backup, for example.
After the backup is created, move it to the location where changelog.txt and nfsetupauditlog.txt reside, then install Heartbeat normally on the Secondary server.