problem with debug attach to process

Fresh install of Unity 5.6.1f1, does self- install of Visual Studio. I was never given a screen to select VS tools of Unity. No previous version of VS installed. Debug>attach to processes shows way too many processes. Next to Undo, Redo in the top menu should be boxes to tell it to attach to an instance of Unity running, which are not populated.

Hi, I have a problem since downloading the plugins for Building for Windows and Linux. A window comes up saying ‘Attach to Process’ and I get 2 options:

-14973 Unity Editor (Unity)

-12902 Unity Editor (Unity)

I have no idea what any of this means and my game and script is working fine. I would very much appreciate some advice on this.