Description of the hotfix rollup package for Virtual PC 2007 Service Pack 1: February 20, 2009


This article describes the Microsoft Virtual PC 2007 Service Pack 1 issues that are fixed in the Virtual PC 2007 Service Pack 1 hotfix that is dated February 20, 2009.

This hotfix provides the following improvements:

Improvement 1

The Virtual PC 2007 support matrix is extended to include the following SKUs:
  • Windows XP Home with Service Pack 2 (SP2)
  • Windows XP Home with Service Pack 3 (SP3)
  • Windows Vista Home with Service Pack1 (SP1)
These additional SKUs were not supported before this hotfix. These Home SKUs are currently supported in this hotfix rollup. Additionally, the following SKUs are supported as guest operating systems:
  • Windows XP Home with Service Pack 2 (SP2)
  • Windows XP Home with Service Pack 3 (SP3)

Improvement 2

This hotfix rollup includes following significant performance and stability improvements in virtual machine networking:
  • A virtual machine that uses a network in the Shared Networking (NAT) mode has severely low performance compared to a virtual machine that uses the Bridged Network mode. This hotfix rollup provides a marked improvement in virtual machine networking performance in Shared Networking (NAT) mode.
  • When using a bridged mode of networking, the guest will mirror the connection state of the host network adapter to which the guest adapter has been bound. When using Shared Networking (NAT), the guest network adapter will be disconnected only when all network adapters on the host are disconnected.

  • It takes a long time to copy multiple and large files to and from a virtual machine that is using the Shared Networking (NAT) mode. Additionally, this process sometimes results in stopping the network connection or stopping the copying process.
  • Auto detection of the http proxy works with Shared Networking (NAT) after you install this hotfix rollup.
  • This hotfix rollup sets the correct WINS address as part of the DHCP address assignment.

Improvement 3

The resolution is now extended to 2048x1920 (32bit). Virtual PC 2007 SP1 supported a screen resolution of up to 1600 x 1200.

This hotfix also fixes the following issues that are not previously documented in a Microsoft Knowledge Base article:

Issue 1

If a virtual machine window is closed while one of its child windows is active, the Virtual PC 2007 process crashes.

Issue 2

Some operating systems crash when they run in the virtual machine. When this happens, the host operating system may crash. This problem occurs when the guest operating system allocates the system memory in such a way that the virtual machine monitor component of virtual PC cannot find memory for its internal data structures. Under such circumstances, virtual machine monitor returns a fatal error exception to the guest operating system and prevents the crash on the host operating system.

Issue 3

Inconsistent behavior of Virtual PC 2007 occurs when you shut down a virtual machine that has the Undo disks option enabled. A dialog box may be displayed to ask you to decide what you want to do with your virtual hard disks when the close action is set to Automatically close without any message.

Issue 4

The virtual machine additions installation cannot start and shows the Windows Installer Help window. This problem occurs when the value of environment variable %temp% in the guest operating system includes a white-space.


Hotfix Information

The following files are available for download from the Microsoft Download Center:

Virtual PC 2007 hotfix package, 32-bit versions
Download Download the 958162 package now.

Virtual PC 2007 hotfix package, 64-bit versions
Download Download the 958162 package now.

Release Date: February 20

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.


You must have Virtual PC 2007 SP1 installed before you install this hotfix.

Hotfix installation

To install this update, save the .msp file locally. If you are running Windows Vista, Windows Vista Service Pack 1, or Windows Server 2008, run the update from an elevated command prompt. To do this, use the following command syntax:

msiexec /p path of .msp file
If you are running an earlier version of Windows, double-click the downloaded .msp file to start the installation process. Then, follow the installation instructions.

Restart Requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix Replacement Information

This hotfix does not replace a previously released hotfix.

Registry Information

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

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.
Virtual PC 2007 Service Pack 1, x86 version
File nameFile versionFile sizeDateTimePlatform
Virtual PC.exe6.0.210.04,475,7522-Feb-2009 22:13x86
VPCHelper.exe6.0.210.051,5922-Feb-2009 22:13x86
VMAdditions.isoNot Applicable29,173,7602-Feb-2009 22:13x86
VMM.sys1.1.654.0230,2562-Feb-2009 22:13x86
Virtual PC 2007 Service Pack 1, x64 version
File nameFile versionFile sizeDateTimePlatform
Virtual PC.exe6.0.210.04,475,7522-Feb-2009 22:14x64
VPCHelper.exe6.0.210.063,3602-Feb-2009 22:14x64
VMAdditions.isoNot Applicable29,173,7602-Feb-2009 22:14x64
VMM.sys1.1.654.0295,2802-Feb-2009 22:14x64


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


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