Microsoft Windows Vista Home Basic Upgrade Additional License Pack - 1 PC Lets you run Vista Home Basic Update on one additional PC, so more people in your household can enjoy this user-friendly software's search and organize innovations as well as improved networking opportunities Designed for users with the most basic computer needs Helps people use their PCs securely and reliably, makes it simple to stay better connected, and is compatible with the widest range of software, devices, and services that people use and trust every day Rich new interface, innovative ways to organize and find the information stored on your PC, and a multitude of entertainment options with live and recorded TV on your PC Upgrade from your current edition of Microsoft Windows XP or Windows 2000 (including Windows XP Professional, Windows XP Home, Windows XP Media Center, Windows XP Tablet PC, Windows XP Professional x64, Windows 2000)