MSTN.2023 - DLL error pointcloudmdl.dll

When I start MS 2023.  I get this error pop up.

OS could not load C:\Program Files\Bentley\MicroStation 2023\MicroStation\mdlsys\required\pointcloudmdl.dll, error 193.
MDL Loader: Unable to load library (DLL or MDL shared library) pointcloudmdl
log4net:ERROR XmlHierarchyConfigurator: Cannot find Property [createpath] to set object on [log4net.Appender.RollingFileAppender]

When I try to use MS I get this .NET error

I have had a look in the folder and the dll exists.  any ideas?

Ian