![]() ![]() If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. This hotfix might receive additional testing. Apply this hotfix only to systems that are experiencing this specific problem. However, this hotfix is intended to correct only the problem that is described in this article. Resolution Hotfix informationĪ supported hotfix is available from Microsoft. Because no driver is found to match the old class GUID, Device Manager detects the driver as an unsigned driver. This problem occurs because Device Manager verifies the digital signing information by using the class GUID of the previous driver and the driver name of the current driver. Not digitally signedThis behavior occurs even though the driver is digitally signed. However, the Digital Signer field on theÄriver tab displays the following status message: On a computer that is running Windows Vista or Windows Server 2008, you open Device Manager to review the properties of a driver. Windows Vista Starter Windows Vista Home Premium Windows Vista Home Basic Windows Vista Ultimate Windows Vista Enterprise Windows Vista Business Windows Vista Business 64-bit Edition Windows Vista Ultimate 64-bit Edition Windows Vista Home Premium 64-bit Edition Windows Vista Home Basic 64-bit Edition Windows Vista Enterprise 64-bit Edition Windows Server 2008 Standard Windows Server 2008 Enterprise Windows Server 2008 Datacenter Windows Server 2008 Datacenter without Hyper-V Windows Server 2008 Enterprise without Hyper-V Windows Server 2008 for Itanium-Based Systems Windows Server 2008 Standard without Hyper-V Windows Server 2008 Web Edition More. ![]()
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