Columns are showing up as numbers, not letters.

[PaulO]

Opened Excel XP and found instead of column letters, they are now numbers.
Never seen this before and can't seem to find a solution to get the letters
back.

 

[Sloth]

Tools->Options->General Tab
DeSelect R1C1 Reference Style

 

[PaulO]

Mahalo Sloth! Wonder how this happened in the first place? Aloha!