不能在Visual Studio中添加实体数据模型

I am running Visual Studio 08 Team Edition with .NET Framework 3.5 SP1 on WinXP. I am trying to add a Entity Data Model to my project, however, the option to add an "ADO.NET Entity Data Model" selection does not appear. To give you a visual, I am essentially following the directions I am running Visual Studio 08 Team Edition with