Windows
Download security updates, service packs, PowerToys, and more for Microsoft Windows.
Get the latest security downloads visit Microsoft Update
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Windows Installer 3.1 Redistributable
The Microsoft® Windows® Installer is an application installation and configuration service. WindowsInstaller-KB893803-x86.exe is the redistributable package for installing or upgrading Windows Installer.
9/2/2005
#4
The Microsoft DirectX® End-User Runtime provides updates to 9.0c and previous versions of DirectX — the core Windows® technology that drives high-speed multimedia and games on the PC.
11/11/2008
#6
Windows Malicious Software Removal Tool
This tool checks your computer for infection by specific, prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps to remove the infection if it is found. Microsoft will release an updated version of this tool on the second Tuesday of each month.
11/11/2008
#7
Security Update for Windows XP (KB958644)
A security issue has been identified that could allow an unauthenticated remote attacker to compromise your Microsoft Windows-based system and gain control over it.
10/22/2008
#8
Windows XP Service Pack 3 Network Installation Package for IT Professionals and Developers
This installation package is intended for IT professionals and developers downloading and installing on multiple computers on a network. If you're updating just one computer, please visit Windows Update.
5/6/2008
#9
Windows Defender is a free program that helps you stay productive by protecting your computer against pop-ups, slow performance and security threats caused by spyware and other potentially unwanted software. Windows Defender no longer supports Windows 2000 as mainstream support ended in June 2005.
5/23/2007
#10
Windows Search 4.0 for Windows XP (KB940157)
Windows Search 4.0 is an updated component of Windows that enables instant search on your computer.
6/3/2008
#12
Windows Vista Service Pack 1 Five Language Standalone (KB936330)
Windows Vista Service Pack 1 is an update to Windows Vista that addresses key feedback from our customers. SP1 addresses specific reliability and performance issues, supports new types of hardware, and adds support for several emerging standards.
3/18/2008
#18
Windows Media® Components for QuickTime
With Windows Media® Components for QuickTime, by Flip4Mac™, you can play Windows Media files (.wma and .wmv) directly in QuickTime Player and view Windows Media content on the Internet using a Web browser.
9/5/2008
#19
Windows Media Player 11 for Windows XP 
The media player for all your digital entertainment needs.
10/2/2008
#21
Windows XP Service Pack 2 for IT Professionals and Developers
This installation package is intended for IT professionals and developers downloading and installing on multiple computers on a network. If you're updating just one computer, please visit Windows Update
8/10/2004
#22
Microsoft .NET Framework 3.0 Redistributable Package
The Microsoft® .NET Framework version 3.0 redistributable package installs the common language runtime and associated files required to run applications developed to target the .NET Framework 3.0.
11/21/2006
#24
Windows Vista Upgrade Advisor is designed to help Windows XP users identify whether their PCs are ready for an upgrade to Windows Vista, which edition of Windows Vista meets their needs, and which features of Windows Vista will be able to run on their PCs.
12/20/2007
#27
The Microsoft® Windows® Installer (MSI) is the application installation and configuration service for Windows. These download packages will update the version of Windows Installer on your system to version 4.5.
6/2/2008
#29
Windows XP Service Pack 3 Overview
Windows® XP Service Pack 3 (SP3) includes all previously released updates for the operating system. This update also includes a small number of new functionalities, which do not significantly change customers’ experience with the operating system. This white paper summarizes what is new in Windows XP SP3.
5/6/2008
#31
This download provides the DirectX end-user redistributable that developers can include with their product.
8/18/2008
#33
Update for Windows XP (KB932823)
Install this update to resolve an issue in which a user is unable to use Windows Internet Explorer 7 to download files on a computer that is running Windows XP with IME enabled.
5/28/2008
#36
Service Pack Update for Virtual PC 2007 qualifying Windows Server 2008, Vista SP1 and XP SP3
5/15/2008
#37
Update for Windows Media Player 11 for Windows Vista (KB931621)
Microsoft has released KB931621 Update.
3/26/2007
#39
SyncToy helps you copy, move, rename, and delete files between folders and computers quickly and easily.
8/15/2008
#46
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