I’ve install windows 8 consumer preview and Visual studio 11 developer preview.
After I’m creating a new windows project and attempting to build VS says that it needs .net framework 4.5 while .net framework 4.5 is already installed!

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Using Visual Studio 11 Developer Preview means this error message is expected.
You are required to switch to Visual Studio 11 Beta,
http://www.microsoft.com/visualstudio/11/en-us