I installed VS2015 with update 1 on Windows 7 Entreprise English over Visual Studio 2015. The setup result was some error(s). I Restarted my machine and run the setup again. The
I found this, maybe that can solve your problem:
Packages not loading after installing visual studio 2015 RTM
By Shittu Joseph Olugbenga
All i did to get it working was to follow this step: 1.Close all instances of Visual Studio 2.Delete everything in this folder C:\Users\\AppData\Local\Microsoft\VisualStudio\12.0\ComponentModelCache 3.Restart Visual Studio
Though I have not tried this for 2015, I believe this should solve the problem too. To do this for visual studio 2015, 12.0 should be changed to 14.0