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ITsVISTA KB-Link: KB955557

Even when a driver is digitally signed, Device Manager displays a “Not digitally signed” message for the driver on a computer that is running Windows Vista or Windows Server 2008

On a computer that is running Windows Vista or Windows Server 2008, you open Device Manager to review the properties of a driver. However, the Digital Signer field on the Driver tab displays the following status message:

Not digitally signed

This behavior occurs even though the driver is digitally signed.

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 KB955557.

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