Zune 4.0 software is free and has new features to help you discover more entertainment to enjoy anytime, anywhere.
To get the most out of Zune, your computer should meet system requirements, including a 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor and 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit). You'll need a broadband Internet connection to make buying and streaming content a breeze, and a CD-R or DVD±R drive to burn CDs or DVDs. Of course, a wi-fi network is necessary for you to wirelessly sync your Zune to your computer.
http://go.microsoft.com/?linkid=7313338
