Windows Vista Service Pack 1 (SP1) is an update to Windows Vista that addresses feedback from Windows users. In addition to previously released updates, SP1 will contain changes focused on addressing specific reliability, performance, and compatibility issues; supporting new types of hardware; and adding support for several emerging standards.

SP1 also will continue to make it easier for IT administrators to deploy and manage Windows Vista. Windows Vista Service Pack 1 Five Language Standalone version can be installed on systems with any of the following language versions: English (US), French, German, Japanese, or Spanish (Traditional).
The download size from Windows Update of Windows Vista SP1 for x86 is 65 MB and for x64 is 125 MB.
If you have a prior version of the Windows Vista SP1 beta installed, you must uninstall it prior to installing the final version.
Download Vista SP1 Standalone Installer (32-bit)
Download Vista SP1 Standalone Installer (64-bit)
Things to Know Before you Download Windows Vista SP1
This article was posted by VG in following section: Windows Vista.
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Ronald
Dear Vishal,
It is not only useful but presented in a way where most if not all the angles are approached. You provide people with a link to download the service pack and also a link to the microsoft recommendations on what how and when to do it. Which in tuen helped me clear up a problem i had that would have prevented me from receiveing this important update. I had no clue that an error while installing an update i did not need was preventing me from receiving SP1. with that fixed i am not about to install it and see how it goes