Missing menu bar (File, Tools, View, etc)

Hi folks
I’ve been using the free trial of Rhino 5 on my computer for a month or so.
But, last time I loaded it up, there were no menu buttons at the top of the window. I’ve tried resetting toolbars to default but it did not work.

Hi Ian- in Options > Appearance > ‘Show the following items’, make sure Menu is checked.