When you want to have it all, choose Windows Vista Ultimate. It’s the most complete edition of Windows Vista—with the power, security, and mobility features that you need for work, and all of the entertainment features that you want for fun. Enjoy the elegant, visually compelling Windows Aero desktop experience, complete with Flip 3D navigation. Take advantage of all Windows Vista safety features to help protect your computer, your information, and your family from accidents and malicious software.

Windows Vista Service Pack 1 (SP1) is the complete set of Windows Vista updates Microsoft has issued over the past year plus additional enhancements to improve your PC experience. SP1 doesn't add new features or require you to learn anything new—it simply makes your PC more reliable, run more smoothly, and even more enjoyable to use. SP1 addresses specific reliability and performance issues, supports new types of hardware, and adds support for several emerging standards.

If you are confused about the different editions, click here to choose the edition of Windows Vista that's right for you.