Windows Vista activation is a process that verifies that a copy of the Windows Vista operating system is genuine and has not been illegally copied or distributed. Activation is required in order to use all of the features of Windows Vista, such as automatic updates, personalization, and access to certain features of Windows Media Player.
There are several ways to avoid Windows Vista activation. One way is to use a KMS (Key Management Service) server. A KMS server is a server that provides activation keys to client computers on a network. Client computers can activate with the KMS server without having to connect to the Internet.