title: npm install for some packages (sqlite3, socket.io) fail with error MSB8020 on Windows 7
body: <p>When trying to install some node.js packages (sqlite3 and socket.io in particular) using <code>npm install socket.io</code> on my Windows 7 machine with Visual Studio 2012 (and not 2010) I had some failures that looked like this:</p>
  
  <blockquote>
    <p>C:\Program Files
    (x86)\MSBuild\Microsoft.Cpp\v4.0\V110\Microsoft.Cpp.Platform.targets(35,5):
    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.</p>
  </blockquote>