Help, my column headings have turned from letters into numbers!

C

charry47

I have no idea how it happened, but every time I open a new Exce
spreadsheet all of my column headings are numbers instead of letters.
How do I turn it back? It's making it very confusing for me to ente
formulas since referring to a cell as "A1", for example, no longe
works.

Thanks
 
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