This article describes a hotfix for Windows Installer for computers that are running Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008. This hotfix fixes the following four issues:

Describes an update that installs version 1.9 of the WinUSB driver file and library file on a computer that is running Windows XP, Windows Vista, or Windows Server 2008.

Describes the Application Compatibility Update for Windows XP Professional x64 edition, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, Windows Embedded Standard 7, and Windows Server 2008 R2 that is dated October 2010.

Explains how to correct an issue that occurs if you run a repair installation of Windows XP before you first uninstall a later version of Internet Explorer. In this scenario, the later version of Internet Explorer no longer works.

Learn what it means if you have an older version of Windows that's no longer supported.

For example, when a person buys Windows XP, that copy of Windows XP is primarily licensed for use on a single computer. Without the purchase of additional licenses, that copy of Windows XP may not be installed on additional computers.

Describes the request for Windows Genuine Advantage validation that occurs when the user downloads updates for Windows XP or Windows Vista. Provides information about how to respond to the request.

Describes the Windows Installer 3.1 v2 download that is available as a redistributable system component for Windows 2000 SP3, Windows 2000 SP4, Windows XP, Windows XP SP2, and Windows Server 2003.

Describes the new and improved features of Microsoft Windows Installer 4.5. The article also discusses the issues that are addressed from earlier versions of Windows Installer.

UAA describes a class driver initiative for computer audio solutions that are supported in Microsoft Windows operating systems. An audio device that is UAA-compliant can rely on the operating system for driver support.