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ITsVISTA KB-Link: KB955558

You cannot use a smart card certificate to log on to a domain from a Windows Vista-based or a Windows Server 2008-based client computer

In a Windows 2008-based domain that is using the Active Directory directory service, you enable a client computer to use smart card authentication to log on to the domain. However, when you try to log on to the domain from a Windows Vista-based or a Windows Server 2008-based client computer, the logon process may fail, and you may receive the following error message:

No valid certificates found
Check that the card is inserted

This issue occurs if the smart card certificate does not contain Microsoft Extended Key Usage (EKU).

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB955558.

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