Symptoms
Assume that you run a Windows XP Mode virtual machine in Shared Networking mode on a Windows 7-based computer. When you try to copy a file from the Windows XP Mode virtual machine to a file server, the file transfer speed is slow. Specifically, the file transfer speed is slower than the transfer speed when the computer is not running Windows XP Mode or when Windows XP Mode is not running in Shared Networking mode.
Cause
This issue occurs because Windows Virtual PC does not return a "TCP Windows update" ACK response to the guest operating system when Virtual PC successfully sends data to the remote host. Therefore, the guest operating system waits for 5 seconds before it sends the next packet.
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=supportNote 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 7 or Windows 7 Service Pack 1 (SP1).For more information about how to obtain a Windows 7 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2
Registry information
To apply this hotfix, you do not have to make any changes to the registry.
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.
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 file information note
Important Windows 7 and Windows Server 2008 R2 updates are included in the same packages.
-
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
SR_Level
Service branch
6.1.760 0. 20xxx
Windows 7 and Windows Server 2008 R2
RTM
LDR
6.1.760 1. 21xxx
Windows 7 and Windows Server 2008 R2
SP1
LDR
-
The MANIFEST files (.manifest) that are installed for each environment are listed separately in the "Additional file information 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
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Vpc.exe |
6.1.7600.21180 |
3,330,560 |
04-Apr-2012 |
4:32 |
|
Vpc.exe |
6.1.7601.21957 |
3,330,560 |
04-Apr-2012 |
4:18 |
For all supported x64-based versions of Windows 7
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Vpc.exe |
6.1.7600.21180 |
4,514,816 |
04-Apr-2012 |
5:19 |
|
Vpc.exe |
6.1.7601.21957 |
4,514,816 |
04-Apr-2012 |
5:17 |
Workaround
To work around this issue, configure bridge mode network in the Windows XP Mode.
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 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 updatesFor more information about Windows XP Mode, go to the following Microsoft website:
General information about Windows XP ModeFor more information about Windows Virtual PC, go to the following Microsoft website:
General information about Windows Virtual PC For more information about the differences between Shared Networking and Virtual Switch Networking in Virtual PC, click the following article number to view the article in the Microsoft Knowledge Base:
824979 Differences between Shared Networking and Virtual Switch Networking in Virtual PC
Additional file information
Additional file information for Windows 7
Additional files for all supported x86-based versions of Windows 7
|
File name |
X86_1bd410340a6a8369a68b7660d48a2c23_31bf3856ad364e35_7.1.7601.21957_none_b74602a0ecdee789.manifest |
|
File version |
Not Applicable |
|
File size |
709 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
9:31 |
|
File name |
X86_a3404f2708b97a122bd5c854a12d5aad_31bf3856ad364e35_7.1.7600.21180_none_d17b81a7c4f86fa3.manifest |
|
File version |
Not Applicable |
|
File size |
709 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
9:31 |
|
File name |
X86_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7600.21180_none_abf9f091643b7c58.manifest |
|
File version |
Not Applicable |
|
File size |
144,595 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
5:01 |
|
File name |
X86_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7601.21957_none_ae07e92561430fb7.manifest |
|
File version |
Not Applicable |
|
File size |
144,595 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
4:47 |
Additional files for all supported x64-based versions of Windows 7
|
File name |
Amd64_92d989ef9048400788207cad0cd700de_31bf3856ad364e35_7.1.7601.21957_none_8cb5ed002d930fb3.manifest |
|
File version |
Not Applicable |
|
File size |
713 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
9:31 |
|
File name |
Amd64_b6f36390cb5fe1398ce7cf9e0295c0a0_31bf3856ad364e35_7.1.7600.21180_none_2489e92b3d30ff21.manifest |
|
File version |
Not Applicable |
|
File size |
713 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
9:31 |
|
File name |
Amd64_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7600.21180_none_08188c151c98ed8e.manifest |
|
File version |
Not Applicable |
|
File size |
144,599 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
5:54 |
|
File name |
Amd64_microsoft-windows-virtualpc-application_31bf3856ad364e35_7.1.7601.21957_none_0a2684a919a080ed.manifest |
|
File version |
Not Applicable |
|
File size |
144,599 |
|
Date (UTC) |
04-Apr-2012 |
|
Time (UTC) |
5:49 |
