Try:

Tools|Options|Error Checking tab
Turn off the things you don't like

(You may find that those warnings are nice and want to keep them turned on.)

David wrote:

Recovering from major crash, had to reload XP and Office 2003, etc. Now
when I open an Excel workbook, I get a small triangular mark in the upper
left-hand corner of some cells. Apparently to do with formatting. Anyway,
try as I might I can't find the right box to click to get rid of it.

Been here before but I don't remember what to do. Appreciate any
suggestions

Thx
Dave

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Dave Peterson