That is not a virus, but a setting.

Goto ToolsOptionsGeneral and uncheck the R1C1 reference style checkbox.

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HTH

Bob Phillips

"Susannah" wrote in message
...
A colleague of mine seems to have an Excel virus that corrupts a worksheet
and changes standard Excel column header settings from letters to numbers.
Once this worksheet is opened it seems to trigger a default through-out
Excel
so that when-ever another worksheet is opened the column header settings
always show as numbers instead of letters.

Does anyone know of this virus and is there a way to solve it?