This error occurs when the path to the program file (EXCEL.EXE) used to launch Microsoft Excel has been moved.   The path to this file is specified in the GIFTS External Preferences, which must be updated after you make changes to your installation of Microsoft Excel.
  1. Open the Administrator Module 
  2. Select Setup>Preferences>External
  3. Adjust the file path under 'Spreadsheet Used' as needed to reflect your system settings