A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
"take a back-up of that OSF.DLL file and delete it.
C:\Program Files\Microsoft Office 15\root\Office15\OSF.DLL
Or
C:\Program Files\Microsoft Office\Office15\OSF.DLL
Once the file is deleted open Excel and check if the issue persists."
worked for me