I've tried to install Emacs on Windows (7) with msys2, however, I'm not sure if it worked. In any event, I can't find it on my machine. The install (following these instructions seems to go fine -- but then no Emacs.
If you have chosen all the default paths while installing msys (pacman), you can find 'emacs.exe' under C:\msys64\mingw64\bin\ on your windows machine as the pacman command installs it under the same catalog as itself. Go there and double click 'emacs.exe' app to launch it. You can also right click on the executable file(emacs.exe) and pin it to either start or task bar for the future shortcuts.