When you install this security update on a computer that is running Windows Vista or Windows Server 2008, you may have to restart the computer two times to complete the installation. This issue may occur if you install an XML Core Services 4.0–based update together with an update that contains inbox drivers. For example, the following updates contain inbox drivers:
956697 Windows Server 2008 Hyper-V VSS writer is not used during a backup job because of corrupted or invalid virtual machine configuration files
938371 A software update is available for the Windows Vista installation components
This issue occurs because Microsoft Windows Installer (MSI)-based installations will not continue while inbox drivers are updating. This is because inbox drivers set the "impactful transaction" flag and the "reboot required" flag at the servicing stack level for Windows Vista and for Windows Server 2008. Therefore, the update for XML Core Services 4.0 will fail during installation if an update that contains an inbox driver is applied first. After the inbox driver is installed, and the computer is restarted, the installation of security update for XML Core Services 4.0 will succeed. However, an additional restart is required to complete the installation.
To avoid this issue, install the security update for XML Core Services 4.0 before you install the update that contains inbox drivers.
Security update 2721691 does not support the complete removal of MSXML 4.0.
This situation occurs because this version of MSXML is installed in side-by-side mode. To work around this issue, follow these steps:
Install update 973685. For more information about update 973685, click the following article number to view the article in the Microsoft Knowledge Base:
973685 Description of an update for Microsoft XML Core Services 4.0 Service Pack 3
Install this security update 2721691.
Remove security update 973685 by using the Add or Remove Programs item in Control Panel.
Delete the Msxml4.dll file from the %SystemRoot%\System32 folder.
Repair the previous installation of MSXML 4.0 (from step 2) by using the Add or Remove Programs item in Control Panel.
The earlier versions of the Msxml4.dll file and of the Msxml4r.dll file are restored to the side-by-side folder and to the %SystemRoot%\System32 folder.
You must restart the computer after you install this security update.
For Microsoft XML Core Services 4.0, this update does not support the complete removal of MSXML4. For more information, please see the "Known issues with this security update" section.
Security update replacement information
This security update replaces the following security update:
954430 MS08-069: Description of the security update for XML Core Services 4.0: November 11, 2008
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.
update security_patch security_update security bug flaw vulnerability malicious attacker exploit registry unauthenticated buffer overrun overflow specially-formed scope specially-crafted denial of service DoS TSE
This article applies to the following:
Microsoft XML Core Services 4.0 Service Pack 3 when used with:
Windows Server 2012
Windows 7 Service Pack 1
Windows Server 2008 R2
Windows Server 2008 R2 Service Pack 1
Windows Server 2008 Service Pack 2
Windows Vista Service Pack 2
Windows Server 2008 Service Pack 2
Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2