Class not registered means that the software is trying to load up another piece of software which is normally an ActiveX control (*.OCX)
It indicates that the software has not been installed correctly, or you don't have enough access rights (in a network environment)
Normally, you will find that logging in as the Administrator, (optionally) re-installing the software, and trying again will remove the fault - if your login profile will not allow the OCX to run, then you will have to contact your IT network support.
If this appears when connecting to the real machine, then it is one of the files:
MintControl5xxx.OCX in the
C:\Program Files\Denford\VRMilling5 directory that cannot be found as it is not registered.
There is a utility on most Denford software CDs called
AutoReg.exe in the \Utility directory
This little program will let you register DLL and OCX files in windows (providing you have sufficient rights to do so)