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.

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 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.

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 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.

Learn how to back up and restore apps, settings, files, photos, and Microsoft Edge favorites and preferences on your Windows PC using Windows Backup.

Learn how to add user accounts in Windows 10 and Windows 11. With an account, each person has separate files, browser favorites, and a private desktop.

Get answers to some common questions about 32-bit and 64-bit versions of Windows.

Windows Update also installs the latest software updates to improve the reliability of Windows, which includes new drivers for your hardware. If you have devices running an unsupported version of Windows, we recommend upgrading them to a more current, in-service, and supported Windows release.