Blank Excel File

When one of our users starts Excel without opening a file, it always opens an .xls file out of the c:\program files\Microsoft Office\Office\Library folder instead of opening a blank spreadsheet. Before calling me, she tried deleting the first one itwas opening, but the next time she started Excel, it opened the next .xls file in the Library folder. Is there a setting somewhere that tells it what document to use for it’s blank new documents? Any other ideas of what’s wrong? Thanks!