Windows Explorer may crash randomly when the network discovery state is set to On in Windows 7 or in Windows Server 2008 R2

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Article ID: 2494427 - View products that this article applies to.
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SYMPTOMS

On a computer that is running Windows 7 or Windows Server 2008 R2, you may encounter a Windows Explorer crash that occurs randomly.

Note This issue usually occurs when the network discovery state is set to On.

CAUSE

This issue occurs because of a race condition that occurs in Networkitemfactory.dll among COM threads.

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 the problem described in this article. 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 website:
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.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • 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
    6.1.760 0.16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0.20xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. 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, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Networkexplorer.dll6.1.7600.163851,661,44014-Jul-200901:16
Networkitemfactory.dll6.1.7600.2087941,47213-Jan-201105:41
Networkitemfactory.mofNot applicable68310-Jun-200921:21
Networkmap.dll6.1.7600.208792,130,94413-Jan-201105:41
Networkmap.mofNot applicable63110-Jun-200921:21
Networkexplorer.dll6.1.7601.175141,661,44020-Nov-201012:20
Networkitemfactory.dll6.1.7601.2164041,47213-Jan-201105:37
Networkitemfactory.mofNot applicable68310-Jun-200921:21
Networkmap.dll6.1.7601.175142,130,94420-Nov-201012:20
Networkmap.mofNot applicable63110-Jun-200921:21
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Networkexplorer.dll6.1.7600.163851,672,70414-Jul-200901:41
Networkitemfactory.dll6.1.7600.2087953,24813-Jan-201106:20
Networkitemfactory.mofNot applicable68310-Jun-200920:38
Networkmap.dll6.1.7600.208792,146,81613-Jan-201106:20
Networkmap.mofNot applicable63110-Jun-200920:39
Networkexplorer.dll6.1.7601.175141,672,70420-Nov-201013:27
Networkitemfactory.dll6.1.7601.2164053,24813-Jan-201106:23
Networkitemfactory.mofNot applicable68310-Jun-200920:38
Networkmap.dll6.1.7601.175142,146,81620-Nov-201013:27
Networkmap.mofNot applicable63110-Jun-200920:39
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Networkexplorer.dll6.1.7600.208791,760,25613-Jan-201105:26
Networkitemfactory.dll6.1.7600.20879134,65613-Jan-201105:26
Networkitemfactory.mofNot applicable68310-Jun-200920:42
Networkmap.dll6.1.7600.208792,276,35213-Jan-201105:26
Networkmap.mofNot applicable63110-Jun-200920:43
Networkexplorer.dll6.1.7601.175141,760,25620-Nov-201010:28
Networkitemfactory.dll6.1.7601.21640134,65613-Jan-201105:14
Networkitemfactory.mofNot applicable68310-Jun-200920:42
Networkmap.dll6.1.7601.175142,276,35220-Nov-201010:28
Networkmap.mofNot applicable63110-Jun-200920:43

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 how to configure sharing and discovery in Windows Vista and in Windows Server 2008, visit the following Microsoft TechNet website:
How to configure sharing and discovery in Windows Vista and Windows Server 2008
For more information about how to enable or disable network discovery, visit the following Microsoft Windows website:
How to enable or disable network discovery
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

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameX86_72d7b957d86ccb3f5a49f115f3516d6b_31bf3856ad364e35_6.1.7600.20879_none_15070d6995cb6580.manifest
File versionNot applicable
File size703
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameX86_e6b8ad814d923f170f039c99d210de5c_31bf3856ad364e35_6.1.7601.21640_none_d856a550f791ad87.manifest
File versionNot applicable
File size703
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameX86_microsoft-windows-networkexplorer_31bf3856ad364e35_6.1.7600.20879_none_40c12cacc045cedb.manifest
File versionNot applicable
File size15,122
Date (UTC)13-Jan-2011
Time (UTC)14:30
File nameX86_microsoft-windows-networkexplorer_31bf3856ad364e35_6.1.7601.21640_none_42bef6dcbd5c02e5.manifest
File versionNot applicable
File size15,122
Date (UTC)13-Jan-2011
Time (UTC)14:30
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_235ce3c1c1f72e6a2298b994e778103c_31bf3856ad364e35_6.1.7601.21640_none_cd44bae08a61ff18.manifest
File versionNot applicable
File size707
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameAmd64_4900e3fa8167dfb92167c4ec6a6beee6_31bf3856ad364e35_6.1.7600.20879_none_6aec03537451c087.manifest
File versionNot applicable
File size707
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameAmd64_72d7b957d86ccb3f5a49f115f3516d6b_31bf3856ad364e35_6.1.7600.20879_none_7125a8ed4e28d6b6.manifest
File versionNot applicable
File size705
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameAmd64_9e5ff5cb2487fcf8480c607cb4484383_31bf3856ad364e35_6.1.7600.20879_none_8a01c0007ca3bbf5.manifest
File versionNot applicable
File size1,054
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameAmd64_a5e3953bbdd16c043e2fce36deecc903_31bf3856ad364e35_6.1.7601.21640_none_26bb6965ddb22b19.manifest
File versionNot applicable
File size1,054
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameAmd64_e6b8ad814d923f170f039c99d210de5c_31bf3856ad364e35_6.1.7601.21640_none_347540d4afef1ebd.manifest
File versionNot applicable
File size705
Date (UTC)13-Jan-2011
Time (UTC)14:27
File nameAmd64_microsoft-windows-networkexplorer_31bf3856ad364e35_6.1.7600.20879_none_9cdfc83078a34011.manifest
File versionNot applicable
File size15,126
Date (UTC)13-Jan-2011
Time (UTC)14:32
File nameAmd64_microsoft-windows-networkexplorer_31bf3856ad364e35_6.1.7601.21640_none_9edd926075b9741b.manifest
File versionNot applicable
File size15,126
Date (UTC)13-Jan-2011
Time (UTC)14:32
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_0c45c1188a6118816d0aa5ba2013d9a8_31bf3856ad364e35_6.1.7600.20879_none_000cfe1b2dc8d186.manifest
File versionNot applicable
File size705
Date (UTC)13-Jan-2011
Time (UTC)14:26
File nameIa64_678190762509884c01b92c8d1c6e231c_31bf3856ad364e35_6.1.7601.21640_none_f8b94ab2b6c66799.manifest
File versionNot applicable
File size705
Date (UTC)13-Jan-2011
Time (UTC)14:26
File nameIa64_72d7b957d86ccb3f5a49f115f3516d6b_31bf3856ad364e35_6.1.7600.20879_none_1508b15f95c96e7c.manifest
File versionNot applicable
File size704
Date (UTC)13-Jan-2011
Time (UTC)14:26
File nameIa64_e6b8ad814d923f170f039c99d210de5c_31bf3856ad364e35_6.1.7601.21640_none_d8584946f78fb683.manifest
File versionNot applicable
File size704
Date (UTC)13-Jan-2011
Time (UTC)14:26
File nameIa64_microsoft-windows-networkexplorer_31bf3856ad364e35_6.1.7600.20879_none_40c2d0a2c043d7d7.manifest
File versionNot applicable
File size14,796
Date (UTC)13-Jan-2011
Time (UTC)07:02
File nameIa64_microsoft-windows-networkexplorer_31bf3856ad364e35_6.1.7601.21640_none_42c09ad2bd5a0be1.manifest
File versionNot applicable
File size15,124
Date (UTC)13-Jan-2011
Time (UTC)14:27

Properties

Article ID: 2494427 - Last Review: February 10, 2011 - Revision: 1.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbsurveynew kbfix kbautohotfix kbhotfixserver kbexpertiseadvanced kbqfe KB2494427

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