There is a known problem with the OScommerce power tool that will cause conflicts when running this on a website that does not have an SSL certificate.
Below you will find the solution to fixing this:
(Example: you installed it into /oscommerce )
You will need to FTP into the site
Change to the directory /var/www/html/oscommerce
Now, from here, you have two files to edit:
includes/configure.php
admin/includes/configure.php
You will need to find the following in these files and change:
define('ENABLE_SSL_CATALOG', 'true');
TO
define('ENABLE_SSL_CATALOG', 'false');
DONE!
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