Open new workbook with same instance of excel

Hi All,

Something happened to my default settings in excel 2003, and I am having trouble getting back. Whenever I open multiple workbooks, they open in a new instance of excel. I would like every workbook to open in 1 instance of excel, ! can't figure out how to do it?! The problem initially started when I installed excel 2007, but then reassociated my XLS files to work in excel 2003, because I prefer to use that version.

Any ideas?

Thanks,
Jason

SHG,
Thanks for the quick reply, but this box was already unticked...any other ideas? I will change my profile to reflect I use Excel 2003.

Jason