This article describes the prerequisite software updates
that apply to versions of Windows Vista that are mentioned in the "Applies to"
section. These updates are a prerequisite for Windows Vista Service Pack 1
(SP1). Additionally, these updates help improve reliability when you install or
remove Windows Vista SP1.
Two or three additional software updates are required before
you install Windows Vista SP1. The software updates that are required depend on
the version of Windows Vista that you want to upgrade. Prerequisite update
935509 that is listed in this article only applies to Windows Vista Enterprise
and to Windows Vista Ultimate. The other prerequisite updates that are listed
in this article apply to all versions of Windows Vista.
Windows Vista SP1 is released, these prerequisite updates will be delivered to
most users through Windows Update as part of regularly scheduled monthly
updates. These updates will be installed together with other updates that will
require that you restart the computer. Therefore, an additional restart will
not be required. This delivery method will help simplify installation of the
If you decide to install Windows Vista SP1 by using
the stand-alone installer instead of by using Windows Update, you will not have
to install the prerequisite updates separately. The prerequisite updates will
be installed by the stand-alone installer if they are necessary. The following
three updates are required before you install Windows Vista SP1. However, these
updates are also recommended if you do not intend to install Windows Vista SP1.
These updates help improve reliability and performance when you install future
individual updates from Microsoft:
Update 935509 lets you correctly service Windows
BitLocker Drive Encryption-capable computers. This update only applies to the
following versions of Windows Vista that include Windows BitLocker Drive
A software update is available for versions of Windows Vista that include the Windows BitLocker Drive Encryption feature
- Windows Vista Enterprise
- Windows Vista Ultimate
- Update 938371 updates Windows Vista in order to install or
to remove Service Pack 1 more reliably. For more information, see the "Update
Update 937287 is a prerequisite package that
contains updates to the Windows Vista installation software. The installation
software is the component that handles the installation and removal of software
updates, language packs, optional Windows features, and service packs. This
update is necessary to successfully install and remove Windows Vista SP1 on all
versions of Windows Vista. This update will be available on the Windows Update
Web site soon after the release of update 935509 and before the release of
Windows Vista SP1.
A software update is available for the Windows Vista installation software feature
original release of Update 938371 updates several
internal components that Windows Vista requires in order to install or to
remove Windows Vista Service Pack 1 more reliably. This update must be applied
separately before you install Windows Vista SP1 to make sure that Windows Vista
SP1 can be installed or removed from the computer. Update 938371 is necessary
to install and to remove Windows Vista SP1 on all versions of Windows Vista.
938371 is available from the Windows Update Web site. To obtain this update,
follow these steps:
- Click Start
, click Control Panel, and then click
Collapse this imageExpand this image
- Under Windows Update, click Check
No prerequisites are required.
You must restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.
Update removal information
You cannot remove this update.
Windows PE information
This software update does not apply to Windows Preinstallation
Environment (Windows PE) for the release version of Windows Vista. Therefore,
you cannot install Windows Vista SP1 in Windows PE for the release version of
Windows Vista. If you want to run Windows PE for Windows Vista SP1, you must
perform a clean installation of Windows PE for Windows SP1.
more information about software update terminology, click the following article
number to view the article in the Microsoft Knowledge Base:
Description of the standard terminology that is used to describe Microsoft software updates