as my original anwser was deleted for some obscure reason i try to answer your question again.
as you could see in this link "You can’t use IXSSO to query an Index Server catalog after you install hotfix 2698365 in Windows 7 or Windows Server 2008 R2".
i copy the text from the linked page to my anwser because @Mario wants that:
SYMPTOMS: After you install update 2698365 on a computer that is running Windows 7 or Windows Server 2008 R2, you cannot query an Index Server catalog by using the IXSSO component. Specifically, when you try to call the IXSSO.Query.CreateRecordset method, you receive an error message that resembles the following: No such interface supported -2147467262
CAUSE: "This issue occurs because an old installation of ActiveX Data Objects (ADO) is removed after you install update 2698365."
RESOLUTION: install the hotfix from the linked site