Or, if you want the ultimate in minimalism, forgo graphical interfaces entirely and just run Vim at the command line. (Or do what @Journeyman mentions, but not everybody has a home computer from the 80s lying around, or wants to use one)Fire up Notepad and remove the network cable.
N.B: I don't think Windows has a command line that you can access from outside the GUI. Oh well, I guess you could make the command-prompt window full screen, but I'm not even sure it'll let you do that.
If I was writing this from a Windows machine, I'd check, but I'm not. I became fed up with Windows being simultaneously utterly obtuse and too clever for its own good a very long time ago, and switched to linux.