Problems with Excel formulas when 2002 upgraded to XP
 

Ever since our networked system upgraded Excel from the 2002 version to the
XP version, we have been having random problems with formulas in existing
spreadsheets unformatting and returning errors values like #REF! This happens
to one row at a time, leaving other rows of formulas unaffected, except for
total cells that reference the cells with error values in them.