I am having a protection problem and have tried the unlock and hide solutions
without success...

I have a workbook I am sharing with co workers. Many of the cells have
formulas in them that change cell contents based on inputs. Not all the data
is availabel at once and the workbook is meant to be a "tracker" type that
provids alerts when days have passed etc, based on formulas and conditional
formatting values.

I need to make it idiot proof, ie. when someone type a number into the
wrong cell (say one that should have remained empty) by mistake, then tries
to delete the error the cell is now empty... sans formula and the rest of the
row no longer has the useful interactive "tracker" features.... maybe there
is no way to prevent this, or is there??

Can anyone help with this? Thank you.