A hotfix is available for various issues that prevent successful product installation or upgrade by using Windows Installer on computers that are running Windows XP, Windows Server 2003, Windows Vista, or Windows Server 2008.

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.

Without the purchase of additional licenses, that copy of Windows XP may not be installed on additional computers. For example, if that copy of Windows XP were to be shared with another person and installed on that other person's computer, that would constitute casual copying.

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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 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 Application Compatibility Update for Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 that is dated April 2011.

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.

If you encounter a Windows Genuine Advantage (WGA) message that there is a problem with the product key or the volume license key for your installation of Microsoft Windows XP or Windows Vista, use one of the following methods to resolve the issue.

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.