The 'Provider Package' did not load correctly

Question

VS 2013 Professional - Version 12.0.31101.00 Update 4

All of a sudden, whenever I try to open a project (MVC project or Python project), I get:

Answer 1

Make sure the paths are correct at: Computer\HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\14.0

Mine for example the VisualStudioLocation key changed from "C:\Documents\Visual Studio 2015" to just "Visual Studio 2015" which was problematic.