title: error MSB8008: Specified platform toolset (v110) is not installed or invalid.
body: <p>I modified my VS2010 project in VS2012, and now when I move back to VS2010, it shows:</p>
  
  <p>"error MSB8008: Specified platform toolset (v110) is not installed or invalid. .lease make sure that a supported PlatformToolset value is selected."</p>
  
  <p>But the problem I have already changed the PlatformToolset from v110 to v100 via Project--> Property--> Configureation ..--> General --> PlatformToolset : v100</p>
  
  <p>The error message still there after I compiling the projects again.  I was confused. Could anyone knows what the problem is now? Thanks!</p>