A computer stops responding when you install or run Windows 7 or Windows Server 2008 R2 if the 1394 bus host controller is enabled

Scenario 1

You try to upgrade to Windows 7 or Windows Server 20008 R2 or to perform a clean install of Windows 7 or Windows Server 2008 R2 on a computer that uses a 1394 bus host controller. However, the computer stops responding during the installation process.

Scenario 2

You have a computer that is running Windows 7 or Windows Server 2008 R2. The computer may stop responding if one of the following conditions is true:

• You disable and then enable the 1394 bus host controller.
• You uninstall and then install the 1394 bus driver (1394ohci.sys).
• You wake the computer from sleep.

This issue occurs because the 1394 bus driver in Windows 7 does not issue an Open Host Controller Interface (OHCI) Soft Reset command to the 1394 host controller. This occurs when the computer sets the device to a low power (D3) state. When the computer sets the 1394 host controller to a high power (D0) state, the host controller may generate an incorrect PCI-Express packet. In this situation, the motherboard chipset stops responding. 

Note In Windows Vista and in earlier versions of Windows, the 1394 bus driver issues an OHCI Soft Reset command to the 1394 host controller when the computer sets devices to a low power (D3) state. 

Update information

How to obtain this update

This update is available from the Microsoft Update website:

Prerequisites

There are no prerequisites.

Registry information

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

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

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

• 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

  Version	Product	Milestone	Service branch
  6.1.760 0.16xxx	Windows 7 and Windows Server 2008 R2	RTM	GDR
  6.1.760 0.20xxx	Windows 7 and Windows Server 2008 R2	RTM	LDR

• GDR service branches contain only those fixes that are widely released to address widespread, extremely important 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 and for Windows 7" 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 x86-based versions of Windows 7

For all supported x64-based versions of Windows 7 and 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.

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 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

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