Okay, if that's the route you want to go down then this is what you have to do:

1. Download a backup of your database using phpMyAdmin.
2. Edit all tables to remove references to MyIsam.
3. Change the page encoding in Zen Cart to utf8 in includes/languages/english.php - specifically change
define('CHARSET', 'iso-8859-1');
to
define('CHARSET', 'utf8');
4. Open every single page file in Zen Cart (over 1,000) in a Plain Text Editor set for utf8 encoding, and click Save.
5. Check all those files to make sure there are no odd characters in any of the files now that you have changed the encoding (especially at the start and end of the file).
6. Drop the contents of the MyIsam database which used iso-8859-1 (Latin 1) encoding and upload the modified database in utf8.
7. Upload all modified files.
8. Pray it all works fine.

If you work 16 hour days then you should probably be finished within one week.

I personally think this is taking a sledgehammer to crack a nut and that modifying the product descriptions would be a whole lot easier.

Vger