It could be useful to check the Environment Variable first, which you can see how to do at this page:
As far as checking the registry value, you can do so by opening “Run” from your start menu and typing in “regedit” (without the quotes.) You can then navigate to the location it lists. To give an idea of what it should be set to, my current value is:
C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\
I apologize for the delay but I’m trying to find more reasons as to why this would be occurring. One thing to ask is if you’re using the editor while it’s located on an external hard drive. If this is the case, this could be causing some issues.
This may sound silly and might be wrong, but can you check to ensure that the path set in the registry and the environment variable actually match up with your Visual Studio installation? It’s possible that it was installed elsewhere such as Program Files instead of Program Files (x86) or on another drive.