Find and Replace annoyingly does not work when replacing an apostrophe at the beginning of a cell because Excel does not recognise it as being content of the cell.
To prove it, use =LEFT(A1,1) where A1 contains the text and the result will be c.
Likewise replacing counta with =counta does not work. You end up with '=counta
in the first box:
counta
in the second box
=counta
replace all.