There seems to have been a bad Windows updates. This corrupted my Visual Studio files. After the reboot, no project was able to be loaded. I tried several times and my local files got corrupted. The following is the reference to resolve the issue if you have this one this week:

http://stackoverflow1453.wordpress.com/2013/09/02/visual-studio-2012-error-no-exports-were-found-that-match-the-constraint-contract-name-how-to-solve/