Windows Server 2008 R2 installation may hang if more than 64 logical processors are active

When you try to install Windows Server 2008 R2 on a computer that has more than 64 logical processors, Windows Setup may stop responding in one of the following operations:

• Initialization of Windows Setup
• One of the two restarts that are required to complete Setup

This issue occurs because of an error in the Network Driver Interface Specification (NDIS) driver.

When a computer has more than 64 logical processors, the NDIS driver does not correctly handle some operations. Therefore, the computer encounters stop responding issues and other system failures.

The following hotfix is available to resolve this issue. The following hotfix is not present in either the Windows Server 2008 R2 RTM or Windows Server 2008 R2 Service Pack 1 (SP1) installation media. To install Windows and the hotfix successfully, one of the following options must be followed because the issue occurs during setup.

Option 1

1. Reduce the total number of active logical processors to 64 or less. To do this, follow the instructions from your hardware manufacturer to disable some logical processors on the computer.
2. Install Windows.
3. Install the following hotfix.
4. Re-enable the logical processors that were disabled in step 1. To do this, follow the instructions from your hardware manufacturer.

Option 2

• You can use the Windows Automated Installation Kit (WAIK) to integrate the following hotfix into the installation image that is used to deploy Windows on the computer.
  
  To download the WAIK, visit the following Microsoft Download Center website:
  Download the WAIK for Windows 7
  For more information about the WAIK for Windows 7, visit the following Microsoft website:
  General information about the WAIK for Windows 7
• To avoid many possible scenarios where installation may stop responding, integrate the following hotfix into the Windows image that is deployed and into the Windows PE environment that is used for deployment.
  
  For more information about how to customize a Windows PE image, visit the following Microsoft website:
  How to customize a Windows PE image

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 Web site: 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 Windows Server 2008 R2 or Windows Server 2008 R2 Service Pack 1 (SP1).

For more information about how to obtain a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

Registry information

To use this hotfix, you do not have to change 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 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:

  Version	Product	Milestone	Service branch
  6.1.760 0.16xxx	Windows Server 2008 R2	RTM	GDR
  6.1.760 0.20xxx	Windows Server 2008 R2	RTM	LDR
  6.1.760 1.17xxx	Windows Server 2008 R2	SP1	GDR
  6.1.760 1.21xxx	Windows Server 2008 R2	SP1	LDR

• 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) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MANIFEST files and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows Server 2008 R2

For all supported IA-64-based versions of Windows Server 2008 R2

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

Microsoft has confirmed that this is an issue in Windows Server 2008 R2 and that the issue may cause computers that have more than 64 logical processors to encounter problems. We recommend that you install this hotfix on these computers to ensure a reliable operation.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2

Additional files for all supported IA-64-based versions of Windows Server 2008 R2