MS11-100: Description of the security update for the .NET Framework 1.1 SP1 on Windows XP, Windows Vista, and Windows Server 2008, and on x64 and Itanium-based versions of Windows Server 2003: December 29, 2011


Microsoft has released security bulletin MS11-100. To view the complete security bulletin, visit one of the following Microsoft websites:

How to obtain help and support for this security update

Help installing updates:
Support for Microsoft Update

Security solutions for IT professionals:
TechNet Security Troubleshooting and Support

Help protect your computer that is running Windows from viruses and malware:
Virus Solution and Security Center

Local support according to your country:
International Support

More Information

Download information

The following file is available for download from the Microsoft Download Center:
Download Download the package now.
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.


To install this update, you must have Windows Installer 3.1 or a later version installed on the computer. To obtain the latest version of Windows Installer, visit the following Microsoft website:

Command-line switches for this update

For information about the various command-line switches that are supported by this update, see the following Windows Installer command-line switches document:

227091 Command-Line Switches for the Microsoft Windows Installer Tool

For more information about Windows Installer, visit the following Windows Installer MSDN website:

Restart information

 This security update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, you receive a message that advises you to restart.

Removal information

To remove this security update, use the Programs and Features item in Control Panel.

Security update replacement information

This security update replaces the following security update:

2572067 MS11-078: Description of the security update for the .NET Framework 1.1 SP1 for Windows XP, Windows Vista and Windows Server 2008, and for x64 and Itanium-based versions of Windows Server 2003: October 11, 2011


The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

.NET Framework 1 file information

File nameFile versionFile sizeDateTime

Article ID: 2656353 - Last Review: Jun 11, 2012 - Revision: 1