Visual Studio 2012 error: Package ‘Visual C++ package’ failed to load

1. click the TOOLS—>VISUAL STUDIO COMMAND PROMPT to open the command window
2. input the command “devenv /Setup”
3. open the visual studio 2012 again, it will works.

Source: http://happyivyli.blogspot.com/2013/07/visual-c-package-failed-to-load.html