Hello CFS2007,
The main menu bar is detachable. Did you happen to change
screen resolution and/or remove an additional attached monitor?
Perhaps you moved this menu bar off the viewing area of the primary
monitor.
Try increasing your screen resolution. If that does not bring
it back, re-attach the secondary monitor and see if it is located
there.
You can also try to use keyboard shortcuts to get into the
Customize Tools dialog to bring it back:
1) Press Alt-T
2) Hit Enter.
3) Click on the Toolbars tab.
4) Put the check mark back into Menu Bar.
5) Press Close.
Thank you,
Bobby Walker
Adobe Technical Support