When you try to install Windows Vista, you may receive an error message that resembles the following: This problem occurs if the following conditions are true:

•	The computer uses more than 3 GB of RAM.
•	The computer uses a storage system that is running the Storport miniport driver.
•	The computer uses a controller that uses 32-bit direct memory access (DMA).

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To apply this update, you must use the files that are included in this update package to update the Windows installation source files. For information about how to do this, see the OEM preinstall kit (OPK) documentation or the Automated Installation Kit (AIK) documentation.

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Update information

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

Update for Windows Vista (KB929777)

Download the KB929777 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=240AC3F3-2B60-4B70-B709-06B2BC5B1336)

Update for Windows Vista, 64-bit versions (KB929777)

Download the KB929777 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=91672C7C-614B-404C-850C-377541E93C18)

Release Date: January 30, 2007

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 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.

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Prerequisites

To apply this update, you must have Windows Vista installed on a computer that uses more than 3 GB of RAM.

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Restart requirement

You must restart the computer after you apply this update.

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Update replacement information

This update does not replace any other updates.

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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, 32-bit versions

File name	File version	File size	Date	Time	Platform
Halacpi.dll	6.0.6000.20500	134,760	20-Dec-2006	08:04	x86
Halmacpi.dll	6.0.6000.20500	160,872	20-Dec-2006	08:01	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Hal.dll	6.0.6000.20500	269,928	20-Dec-2006	07:28	x64

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To work around this problem, use either of the following methods:

•	Restart the computer. Then, try to install again.
•	Remove 2 GB of RAM, and then restart the installation process. After Windows Vista is installed, reinstall the RAM.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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For more information about how update packages are named, click the following article number to view the article in the Microsoft Knowledge Base: For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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