If you get the error after installation:

mysql_num_rows() expects parameter 1 to be resource line 39

→ delete the default localhost user entry

It is recommended to follow the following post-installation steps to secure your osCommerce Online Merchant online store:

1. Delete the /media/sf_share/www/htdocs/shop1/install directory.
2. Rename the Administration Tool directory located at /media/sf_share/www/htdocs/shop1/admin.
3. Set the permissions on /media/sf_share/www/htdocs/shop1/includes/configure.php to 644 (or 444 if this file is still writable).
4. Set the permissions on /media/sf_share/www/htdocs/shop1/admin/includes/configure.php to 644 (or 444 if this file is still writable).
5. Review the directory permissions on the Administration Tool → Tools → Security Directory Permissions page.
6. The Administration Tool should be further protected using htaccess/htpasswd and can be set-up within the Configuration → Administrators page.