Hi Giefhell !
Sorry for the problem.
It seems like you dont have full permissions on the xml setting file. You need to be able to write to this file to store your database connection profiles. The file is located in "C:\Program Files\SQL Excel"

or the equivalent on your machine.
The easiest way to fix this should be to
- uninstall the add-in (from the control panel)
- download the new version and install it.
The new version puts the XML settings in a sub-folder of "My Documents" and you should normally be automatically permissioned to read/write to the file.
You can download the new version here
http://www.sqlexcel.net/dload/sql_excel_setup.zip
Excel 2007 and Vista is fine..
Please let me know if this fixes the problem. Thanks,
Al