Cannot use menu in embedded Excel object in Word

In Word 2003, when attempting to edit an inserted object created from an
existing file (Excel 2003 spread***), the source program (Excel) command
menu is only partially usable. The menu appears as expected, but for some
reason none of the submenus except File and Window will list or open. In
other words, if I point to Insert, for example, on the command menu, nothing
at all happens--the list of submenus does not appear.

This used to work and suddenly it does not. Does anyone have any experience
with this problem? Thanks.

We are using Windows XP Professional 2002 with Service Pack 2.
.

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