By default, NERDTree starts in the current working directory. You've probably started Vim through the installed Start Menu shortcut, which defaults to the system32
directory. (You can check from inside Vim with :pwd
.)
I would recommend that you modify the shortcut that starts GVIM (gvim.lnk
: right mouse button > Properties > Start in:) to start in M:\
. That's probably a better default for starting Vim, and it also solves the NERDTree problem.