REGDB_E_CLASSNOTREG (0x80040154), E_POINTER (0x80004003), E_NOINTERFACE (0x80004002), Unable to cast COM object of type 'System.__ComObject' to interface type 'ADODB.Connection' error codes/messages

If you’ve compiled/re-compiled an ADO application on a Windows 7 Service Pack 1-based computer and the app does not run on down-level operating systems with the any of the error messages below, please see our new KB article published today (16th of March, 2011) : Error message 1 REGDB_E_CLASSNOTREG (0x80040154) Error message 2 E_POINTER (0x80004003)…

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