WYSIWYG is Missing

Due to a system failure, I've had to install RH-X5 onto a Vista Ultimate system. I've applied to two updates, but I no longer appear to have RoboHelps WYSIWYG editor available. When I try to open a Topic, Explorer fires up, yet in RH's Options, it is allegedly set to use the internal editor.

On running RoboHelp, I do however get a message saying "Unable to load component 4".
Am I backing a looser here? Does RH-X5 simply not work on Vista?