I don't understand the "click any cell" part but usually people get this
message if their "Open" file association for XLS is set for DDE _and_ there
is a %1 at the end Excel command line. This is viewed via Windows
Explorer-Tools-Folder Options-File Types, pick XLS and click Advanced.
If you have that you'd want to remove the %1.

--
Jim
"Drew" wrote in message
...
| Hi everyone.
|
| Using Excel 2007, only over last few days I have been getting the
following
| pop up as soon as I click any cell in any workbook that I have just opened
| by double-clicking on the file.
|
| "XXX.xls is already open. Reopening will cause any changes you made to be
| discarded. etc"
|
| It is annoying and I would appreciate any advice on what might be
triggering
| this event.
|
| Thank you kindly.
|
|