Hello,
a chart does not need to consist of numbers that add up to 100%, but Excel cannot draw a chart from text. You will need some way to count how often each return reason shows up in the column. Consider the following screenshot:
The data in column a is a list of return reasons. One row per returned item. That data cannot be used in a chart. A chart needs numbers. So, a helper table has been created that uses a formula to count how many times each return reason appears in column A. The formula in cell E2 is
=COUNTIF(A:A,D2)
and has been copied down to cell E6. Now there are numbers that can be plotted in a chart, in this case a horizontal bar chart.
If you need to maintain compatibility with 2003, you need to select "Save as type: Excel 97-2003 Workbook (*.xls)" in the File Save dialog underneath the file name.
There are other possible ways to chart this data, and there are other ways to arrive at the numbers, for example with a pivot table, which looks a bit different in compatibility mode, so I won't go into these details here.