Microsoft KB Archive/941649

= An update is available that improves the compatibility, reliability, and stability of Windows Vista =

Article ID: 941649

Article Last Modified on 11/20/2007

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APPLIES TO


 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Enterprise
 * Windows Vista Home Premium
 * Windows Vista Ultimate
 * Windows Vista Home Basic

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INTRODUCTION
This update improves the compatibility, reliability, and stability of Windows Vista. This update includes the following improvements:
 * It extends the battery life for mobile devices.
 * It improves the stability of portable computers and of desktop computers that use an uninterruptable power supply (UPS).
 * It improves the reliability of Windows Vista when you open the menu of a startup application.
 * It improves the stability of wireless network services.
 * It shortens the startup time of Windows Vista by using a better timing structure.
 * It shortens the recovery time after Windows Vista experiences a period of inactivity.
 * It shortens the recovery time when you try to exit the Photos screen saver.
 * It improves the stability of Windows PowerShell.

This update also resolves the following issues in Windows Vista:
 * A compatibility issue that affects some third-party antivirus software applications.
 * A reliability issue that occurs when a Windows Vista-based computer uses certain network driver configurations.



Known issues

 * This package has been updated to version 2. An issue was identified in which certain computers that have specific older SATA (Serial ATA) controllers that use the AHCI (Advanced Host Controller Interface) protocol and SATA-connected CD or DVD drives may not start after the installation of the original version of this package. Version 2 of this package has removed the fix that caused this problem. If you are using a computer that experienced this issue, you can restart the computer by using a bootable Windows Vista DVD and by selecting the Repair/System Recovery options. If your computer has already installed the original version of this update and has successfully restarted, you do not have to install version 2 of this update.

Note This issue does not apply to the package that is available on Windows Update.
 * There is an issue that causes offline, unattended installations to fail. This issue does not affect users who install this package by using Windows Update or the Microsoft Download Center.

Issue workaround

An unattended installation fails because the package is trying to set ACLs on a directory (%windir%/prefetch) that does not exist. If you must install this package in an offline image, you can create this folder manually before the package is installed. For example, create a C:/Windows/prefetch folder before you install the package in the image.

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

Download the update for Windows Vista x86-based versions (KB941649) package now.

Download the update for Windows Vista x64-based versions (KB941649) 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.



Prerequisites
No prerequisites are required.

Restart requirement
You have to restart the computer after you apply this update.

Hotfix replacement information
This hotfix does not replace any other previously released updates.

File information
The English version of this update 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.

Windows Vista, 64-bit versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; 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

Keywords: kbfix kbqfe kbpubtypekc atdownload kbexpertisebeginner KB941649

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