A computer that is running a virtual machine in Windows Virtual PC may stop responding or restart when you resume it from sleep or from hibernation in Windows 7

Consider the following scenario:

• You have a computer that uses an Intel processor from the Westmere family of processors. For example, the computer has an Intel Arrandale processor (Intel Core i7 6xx series, Core i5 5xx series, or Core i3 3xx series) or an Intel Clarkdale desktop processor (Intel Core i3 5xx series, Core i5 6xx series, or Pentium G9650).
• The computer is running Windows 7.
• You run a virtual machine by using Windows Virtual PC. For example, you run Windows XP Mode.
• You put the computer into the sleep state or into the hibernation state, when the virtual machine is running.
• You try to resume the computer from sleep or from hibernation.

In this scenario, the system may stop responding or restart.

Update information

How to obtain this update

A supported update is available from Microsoft.

If the update 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 update.

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 update. 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:

Prerequisites

To apply this update, your computer must be running Windows 7. Additionally, Windows Virtual PC must be installed on the computer.

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

The English (United States) 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 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	RTM	GDR
  6.1.760 0.20xxx	Windows 7	RTM	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.

For all supported x86-based versions of Windows 7

For all supported x64-based versions of Windows 7

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

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.