Excel 2007
When I open a new Excel file the Message Box "File In Use" appears with the
following.

"PERSONAL.XLSB is locked for editing by "Robert Morris"

Open 'Read Only' or click 'notify' to open read-only and receive
notification when document is no longer in use."

Nothing appears to be "read only" and the new file works properly.

I have searched all avenues. How do I remove this Message Box?

Bob. M