Search for "MDAC 2.8 SP1" on the Microsoft Update Catalog. The filename was typically MDAC_TYP.EXE . This installer will not run on Windows 8, 10, or 11. It will block with an error message: "This version of MDAC is not compatible with this version of Windows."
The ADO library is not properly registered, or a security policy (e.g., UAC on Windows 10) is blocking it. Solution: Re-register msado15.dll as administrator. Also check that the HKEY_CLASSES_ROOT\ADODB.Recordset\CLSID registry key exists.
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