"We're making some updates to Halo 2 for Windows Vista that should improve the install experience and address other technical issues, ensuring that the final retail version provides a fantastic experience for gamers. Given these changes, we will be adjusting the on-shelf date of the product."
The PC version of Halo 2 will ship with achievement points, additional MP maps and a map editor to enhance your multiplayer experience.
screw vista it is a pain in the ass trying to upgrade your PC to run games for the XP as it is 
