Error: "couldn't find adobe pdf converter.xlsx"

[mattb83114933]

I've recently installed Acrobat X on a new computer (Windows 10) and am getting an error that says "Coudn't find adobe pdf converter.xlsx" when trying to combine files into a pdf.  Some of the files are already pdf and some are Excel.  On my old computer I had no problems. 

Can anyone help me with this? 

Thanks.