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 signedThis 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=supportNote 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.

    Version

    Product

    Milestone

    Service branch

    6.0.6000.20xxx

    Windows Vista

    RTM

    LDR

    6.0.6001.22xxx

    Windows Vista SP1 and Windows Server 2008 SP1

    SP1

    LDR

  • 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

File name

File version

File size

Date

Time

Platform

Devmgmt.msc

Not Applicable

145,640

13-Dec-2007

20:25

Not Applicable

Devmgr.dll

6.0.6000.20879

377,344

18-Jul-2008

03:14

x86

Dmocx.dll

6.0.6000.20879

42,496

18-Jul-2008

03:14

x86

Devmgmt.msc

Not Applicable

145,640

18-Dec-2007

21:40

Not Applicable

Devmgr.dll

6.0.6001.22225

377,344

18-Jul-2008

03:20

x86

Dmocx.dll

6.0.6001.22225

42,496

18-Jul-2008

03:20

x86

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Devmgmt.msc

Not Applicable

145,640

14-Dec-2007

22:01

Not Applicable

Devmgr.dll

6.0.6000.20879

506,880

18-Jul-2008

03:29

x64

Dmocx.dll

6.0.6000.20879

49,664

18-Jul-2008

03:29

x64

Devmgmt.msc

Not Applicable

145,640

18-Dec-2007

21:40

Not Applicable

Devmgr.dll

6.0.6001.22225

496,640

18-Jul-2008

03:51

x64

Dmocx.dll

6.0.6001.22225

49,664

18-Jul-2008

03:51

x64

Devmgmt.msc

Not Applicable

145,640

13-Dec-2007

20:25

Not Applicable

Devmgr.dll

6.0.6000.20879

377,344

18-Jul-2008

03:14

x86

Dmocx.dll

6.0.6000.20879

42,496

18-Jul-2008

03:14

x86

Devmgmt.msc

Not Applicable

145,640

18-Dec-2007

21:40

Not Applicable

Devmgr.dll

6.0.6001.22225

377,344

18-Jul-2008

03:20

x86

Dmocx.dll

6.0.6001.22225

42,496

18-Jul-2008

03:20

x86

For all supported Itanium-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Devmgmt.msc

Not Applicable

145,640

18-Dec-2007

21:40

Not Applicable

Devmgr.dll

6.0.6001.22225

786,432

18-Jul-2008

03:27

IA-64

Dmocx.dll

6.0.6001.22225

84,480

18-Jul-2008

03:27

IA-64

Devmgmt.msc

Not Applicable

145,640

18-Dec-2007

21:40

Not Applicable

Devmgr.dll

6.0.6001.22225

377,344

18-Jul-2008

03:20

x86

Dmocx.dll

6.0.6001.22225

42,496

18-Jul-2008

03:20

x86

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

File name

Package_1_for_kb955557~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,951

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_2_for_kb955557~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,789

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_3_for_kb955557~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,789

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_client_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,367

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_client~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,711

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_server~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,084

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

X86_339b9b9098f999c1c124f7234c4c120d_31bf3856ad364e35_6.0.6001.22225_none_ff0a564c4f19d385.manifest

File version

Not Applicable

File size

704

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

X86_d5b6911f37de5983f8961d2a7b7a5f57_31bf3856ad364e35_6.0.6000.20879_none_f6f96135f504f644.manifest

File version

Not Applicable

File size

704

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

X86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6000.20879_none_12374da33ba86c53.manifest

File version

Not Applicable

File size

37,527

Date (UTC)

18-Jul-2008

Time (UTC)

03:35

Platform

Not Applicable

File name

X86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_144f9abd38aa0c33.manifest

File version

Not Applicable

File size

37,527

Date (UTC)

18-Jul-2008

Time (UTC)

04:37

Platform

Not Applicable

Additional files for all supported x64-based versions of Windows Server 2008 and Windows Vista

File name

Amd64_046bba532c39818ba7f13f19fb4b7264_31bf3856ad364e35_6.0.6000.20879_none_99db11af04900d49.manifest

File version

Not Applicable

File size

1,056

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Amd64_8b528901260c622b53c76628469583da_31bf3856ad364e35_6.0.6001.22225_none_364dd390f9b21855.manifest

File version

Not Applicable

File size

1,056

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Amd64_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6000.20879_none_6e55e926f405dd89.manifest

File version

Not Applicable

File size

37,573

Date (UTC)

18-Jul-2008

Time (UTC)

04:54

Platform

Not Applicable

File name

Amd64_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_706e3640f1077d69.manifest

File version

Not Applicable

File size

37,573

Date (UTC)

18-Jul-2008

Time (UTC)

06:47

Platform

Not Applicable

File name

Package_1_for_kb955557~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,185

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_2_for_kb955557~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,021

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_3_for_kb955557~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,021

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_client_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,433

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,375

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_client~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,721

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,433

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_server~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,438

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,098

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

X86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6000.20879_none_12374da33ba86c53.manifest

File version

Not Applicable

File size

37,527

Date (UTC)

18-Jul-2008

Time (UTC)

03:35

Platform

Not Applicable

File name

X86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_144f9abd38aa0c33.manifest

File version

Not Applicable

File size

37,527

Date (UTC)

18-Jul-2008

Time (UTC)

04:37

Platform

Not Applicable

Additional files for all supported Itanium-based versions of Windows Server 2008

File name

Ia64_7695229ec5e1c6a16a4e4a3679038e1c_31bf3856ad364e35_6.0.6001.22225_none_ccef9272042353a1.manifest

File version

Not Applicable

File size

1,054

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Ia64_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_14513eb338a8152f.manifest

File version

Not Applicable

File size

37,550

Date (UTC)

18-Jul-2008

Time (UTC)

05:13

Platform

Not Applicable

File name

Package_1_for_kb955557~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

2,016

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,429

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Package_for_kb955557_server~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,434

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,425

Date (UTC)

18-Jul-2008

Time (UTC)

21:18

Platform

Not Applicable

File name

X86_microsoft-windows-pnpdevicemanager_31bf3856ad364e35_6.0.6001.22225_none_144f9abd38aa0c33.manifest

File version

Not Applicable

File size

37,527

Date (UTC)

18-Jul-2008

Time (UTC)

04:37

Platform

Not 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

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×