Symptoms
When you try to access ActiveX Data Objects (ADO) documentation from within Visual Basic by pressing F1 from the code editor or from within the object browser, nothing occurs, or you receive one of the following error messages:

Unable to display help
-or-

No help available
Resolution
This problem occurs because the following items must exist to access context-sensitive help for ADO in the Visual Basic IDE: The correct version of the ADO compiled HTML help file that corresponds to the ADO version that is referenced in the project references. -and-
An entry in the registry that lists this ADO compiled HTML help file as an available HTML help file. This problem is known to occur when one or both of these items are missing.