Install WP on C drive/Xampp – Install.php gives error 404

I followed recommended tutorial. I had previously installed Xampp (in conjunction with other applications (Joomla, ExpressionEngine) & I can confirm that Apache & MySQL are running as services
Using phpMyAdmin, I created the Database called ‘wordpress’ which is now listed with other databases previously created.

My file configuration is as follows (per tutorial)
C:\xampp\htdocs\wp-admin\install.php (& I can navigate to it and open in an editor)
C:\xampp\htdocs\wordpress\wp-config.php
define(‘DB_NAME’, ‘wordpress’);
define(‘DB_USER’, ‘root’);
define(‘DB_PASSWORD’, ”); i.e. blank
define(‘DB_HOST’, ‘localhost’);

Yet, when I try to run install (in Firefox) ( http://localhost/wordpress/wp-admin/install.php)
I get a 404 error –
“Object not found! The requested URL was not found on this server.”

Any ideas?