It's a little hard to say without seeing your site, but look in includes/languages/english/YOUR_TEMPLATE/index.php (where YOUR_TEMPLATE is the name of your custom template) and see what it says for the following lines:
Code:
Line #31 : define('HEADING_TITLE', 'Available Products');
Line #51 : define('HEADING_TITLE', 'Congratulations! You have successfully installed your Zen Cart™ E-Commerce Solution.');
Line #55 : define('HEADING_TITLE', 'Congratulations! You have successfully installed your Zen Cart™ E-Commerce Solution.');
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