Windows reports error 0x80040155 as: Interface not registered. Programmers know this error as REGDB_E_IIDNOTREG.
DCOM errors typically begin with a "0x800" code.
This error typically occurs when applications are trying to use interfaces (or "features" for which there is no record in the Windows registry.
To solve this problem, use RegSvr32.exe (included with Windows) to register specific OPC DLLs. OPC applications will begin working when you register these DLLs properly because DCOM will be able to find the interfaces.
The following resources are available on OPC Training Institute's website:
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