CONCLUSION:
Tim Golden sent me a patched version of his active_directory.py ver 0.4
and that solved my problem!
Thanks all for your attention and in particular, Tim!
//Maria
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> from win32com.client.gencache import EnsureDispatch
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< _connection = Dispatch ("ADODB.Connection")
---
> _connection = EnsureDispatch ("ADODB.Connection")
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< command = Dispatch ("ADODB.Command")
---
> command = EnsureDispatch ("ADODB.Command")
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>
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