From experience with exporting from older versions of Crystal to Excel, a couple of options:
(1) Export to CSV and open the CSV file in Excel.
This had the disadvantage that instead of appearing at the top of the report above the data values, the column headings would appear on every line of the output before the column values - like so:
No Trans_No 1 123
No Trans_No 2 333
This issue may have been resolved in CR XI - if not, the workround we used for this was to suppress column headings (so that only the values were included in the output), then copy and paste a standard spreadsheet heading for the report into the output in Excel.
(2) Consistently format all fields to the same, minimum size (typically, two grid widths), with columns aligned by snapping the left edge of fields to guidelines.
This produces output which is almost unreadable in the standard report viewer, but which should align correctly in Excel.