Following tutorial and getting a 404 when accessing controllers

I'm following the tutorial and got as far as the controllers section.  Accessing http://localhost/codeIgniter/index.php/blog works but accessing http://localhost/codeIgniter/index.php/blog/comments does not. It throws a 404 error.

I've got base_url set as so: $config['base_url'] = 'http://localhost/codeIgniter';

I've tried adding this to my .htaccess in the /www/codeIgniter directory (as well as a couple variations I found while googling):

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

Mod rewrite is installed.

I've got AllowOverride All in my httpd.conf file.

I also set the index_page as blank.

I've also just tried not rewriting anything.

I'm running on WAMP on Windows 7 with Apache 2.435, and have tried PHP 5.6 and 7.

Have been at this for a couple hours now, please help?

TIA