Found solution 1: Reset skipped packages by running devenv /resetskippkgs
Found solution 2: http://social.msdn.microsoft.com/Forums/en-US/vssetup/thread/5dba2643-1fce-4004-bef6-11cfdf312d8c/
”Here's a solution found somewhere in the inet.
Visual Studio Menu -> Tools -> Import and Export Settings -> Reset all settings
BR, Oleg”