You need Visual Studio 2010 installed, then from Visual Studio 2010, View -> Solution Explorer -> Right Click on your project -> Choose Properties from the context menu, you'll get the windows "your project name" Property Pages -> Configuration Properties -> General -> Platform toolset, choose "Visual Studio 2010 (v100)".
You need the Visual Studio 2012 Update 1 described in Windows XP Targeting with C++ in Visual Studio 2012