Using visual studio 2012 on windows 8 x64 aparantly this is caused by msbuild being moved into .net but I havn\'t seen how to fix it yet.
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In VS 2012, I was getting "SMB2 will not build: Error 1 error MSB8020: The builds tools for Visual Studio 2010 (Platform Toolset = 'v100') cannot be found. To build using the v100 build tools, either click the Project menu or right-click the solution, and then select "Update VC++ Projects...". Install Visual Studio 2010 to build using the Visual Studio 2010 build tools."
Throwing caution to the wind, I tried the suggestion: Selected the Solution in Solution Explorer, then clicked in the "Update VC++" menu item. This did some updateing and then started a build which succeeded.
The "Update VC++" menu item no longer appears in the solution menu.