http://www.netfx3.com/blogs/news_and_announcements/archive/2006/11/06/.NET-Framework-3.0-has-been-released_2100_.aspx You will also need the Vista SDK to be installed first. But I think you will be better of using Visual Studio Orcas. Note that it is a monster download and you need at least 2 GB (3 GB is better) and a hefty dual core or dual processor machine to run it properly as it comes as a virtual image only. It is a currently in beta/CTP release cycle. cheers