I am working with Excel 2007 on a system with Windows XP.

Anytime I either 1) select an existing *.xls file on the desktop or in
windows explorer, or 2) export data from another application straight into
the Excel application, a new instance of Excel opens. I want these files to
be opened in the existing instance (and only open a new instance if one is
not already running). Under *Excel OptionsAdvanced*, I have 'Ignore Other
applications ..." unchecked (I have actually tried this both checked and
unchecked with no luck).

Please help. I have made a good faith effort to find this subject already
addressed in the forums.