change Excel column headings from numbers to alpha characters

[Changing Excel Column Headings]

My Excel spreadsheet has numbers in the column headings. I can't find a way
to change them back to alpha characters.

 

[Dave Peterson]

Tools|Options|General Tab|Uncheck R1C1 Reference Style.

 

[Toppers]

Tools=>Options=>General=>Uncheck R1C1 reference style