Tools|Customize|Toolbars tab
Select the toolbars to show.

Or View|Toolbars
(to do one at a time)

This'll help if they're just hidden/turned off. I'm not sure what disappear
really means.

JackCraig46 wrote:

In excel 2003, the menu bar and all toolbars disappear after I've been using
the program for a period of time. It seems the only way to get them back is
to stop and re-start excel.

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Dave Peterson