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

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Article ID: 955557 - View products that this article applies to.
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SYMPTOMS

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.

CAUSE

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. Because no driver is found to match the old class GUID, Device Manager detects the driver as an unsigned driver.

RESOLUTION

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

No prerequisites are required.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista and Windows Server 2008 file information notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.0.6000.20xxxWindows VistaRTMLDR
    6.0.6001.22xxxWindows Vista SP1 and Windows Server 2008 SP1SP1LDR
  • Service Pack 1 is integrated into Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
  • The MANIFEST files (.manifest) and MUM files (.mum) installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Devmgmt.mscNot Applicable145,64013-Dec-200720:25Not Applicable
Devmgr.dll6.0.6000.20879377,34418-Jul-200803:14x86
Dmocx.dll6.0.6000.2087942,49618-Jul-200803:14x86
Devmgmt.mscNot Applicable145,64018-Dec-200721:40Not Applicable
Devmgr.dll6.0.6001.22225377,34418-Jul-200803:20x86
Dmocx.dll6.0.6001.2222542,49618-Jul-200803:20x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Devmgmt.mscNot Applicable145,64014-Dec-200722:01Not Applicable
Devmgr.dll6.0.6000.20879506,88018-Jul-200803:29x64
Dmocx.dll6.0.6000.2087949,66418-Jul-200803:29x64
Devmgmt.mscNot Applicable145,64018-Dec-200721:40Not Applicable
Devmgr.dll6.0.6001.22225496,64018-Jul-200803:51x64
Dmocx.dll6.0.6001.2222549,66418-Jul-200803:51x64
Devmgmt.mscNot Applicable145,64013-Dec-200720:25Not Applicable
Devmgr.dll6.0.6000.20879377,34418-Jul-200803:14x86
Dmocx.dll6.0.6000.2087942,49618-Jul-200803:14x86
Devmgmt.mscNot Applicable145,64018-Dec-200721:40Not Applicable
Devmgr.dll6.0.6001.22225377,34418-Jul-200803:20x86
Dmocx.dll6.0.6001.2222542,49618-Jul-200803:20x86
For all supported Itanium-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Devmgmt.mscNot Applicable145,64018-Dec-200721:40Not Applicable
Devmgr.dll6.0.6001.22225786,43218-Jul-200803:27IA-64
Dmocx.dll6.0.6001.2222584,48018-Jul-200803:27IA-64
Devmgmt.mscNot Applicable145,64018-Dec-200721:40Not Applicable
Devmgr.dll6.0.6001.22225377,34418-Jul-200803:20x86
Dmocx.dll6.0.6001.2222542,49618-Jul-200803:20x86

Additional file information for Windows Server 2008 and Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File namePackage_1_for_kb955557~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,951
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_2_for_kb955557~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,789
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_3_for_kb955557~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,789
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_client_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,425
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,367
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_client~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,711
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,425
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_server~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,430
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size2,084
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameX86_339b9b9098f999c1c124f7234c4c120d_31bf3856ad364e35_6.0.6001.22225_none_ff0a564c4f19d385.manifest
File versionNot Applicable
File size704
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameX86_d5b6911f37de5983f8961d2a7b7a5f57_31bf3856ad364e35_6.0.6000.20879_none_f6f96135f504f644.manifest
File versionNot Applicable
File size704
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameX86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6000.20879_none_12374da33ba86c53.manifest
File versionNot Applicable
File size37,527
Date (UTC)18-Jul-2008
Time (UTC)03:35
PlatformNot Applicable
File nameX86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_144f9abd38aa0c33.manifest
File versionNot Applicable
File size37,527
Date (UTC)18-Jul-2008
Time (UTC)04:37
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows Server 2008 and Windows Vista
Collapse this tableExpand this table
File nameAmd64_046bba532c39818ba7f13f19fb4b7264_31bf3856ad364e35_6.0.6000.20879_none_99db11af04900d49.manifest
File versionNot Applicable
File size1,056
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameAmd64_8b528901260c622b53c76628469583da_31bf3856ad364e35_6.0.6001.22225_none_364dd390f9b21855.manifest
File versionNot Applicable
File size1,056
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameAmd64_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6000.20879_none_6e55e926f405dd89.manifest
File versionNot Applicable
File size37,573
Date (UTC)18-Jul-2008
Time (UTC)04:54
PlatformNot Applicable
File nameAmd64_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_706e3640f1077d69.manifest
File versionNot Applicable
File size37,573
Date (UTC)18-Jul-2008
Time (UTC)06:47
PlatformNot Applicable
File namePackage_1_for_kb955557~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,185
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_2_for_kb955557~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,021
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_3_for_kb955557~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,021
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_client_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,433
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,375
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_client~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,721
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,433
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_server~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,438
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size2,098
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameX86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6000.20879_none_12374da33ba86c53.manifest
File versionNot Applicable
File size37,527
Date (UTC)18-Jul-2008
Time (UTC)03:35
PlatformNot Applicable
File nameX86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_144f9abd38aa0c33.manifest
File versionNot Applicable
File size37,527
Date (UTC)18-Jul-2008
Time (UTC)04:37
PlatformNot Applicable
Additional files for all supported Itanium-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameIa64_7695229ec5e1c6a16a4e4a3679038e1c_31bf3856ad364e35_6.0.6001.22225_none_ccef9272042353a1.manifest
File versionNot Applicable
File size1,054
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameIa64_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_14513eb338a8152f.manifest
File versionNot Applicable
File size37,550
Date (UTC)18-Jul-2008
Time (UTC)05:13
PlatformNot Applicable
File namePackage_1_for_kb955557~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size2,016
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,429
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File namePackage_for_kb955557_server~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,434
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,425
Date (UTC)18-Jul-2008
Time (UTC)21:18
PlatformNot Applicable
File nameX86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_144f9abd38aa0c33.manifest
File versionNot Applicable
File size37,527
Date (UTC)18-Jul-2008
Time (UTC)04:37
PlatformNot Applicable

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 955557 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • 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 Vista Service Pack 1
  • 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 Web Server 2008
Keywords: 
kbautohotfix kbexpertisebeginner kbexpertiseinter kbbug kbfix kbqfe KB955557

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