Still with index.php problem

[eluser]onecode[/eluser]
Before i'm talking about my problem here, i'm sorry for this topic, i know there are many thread about this topic --> "how to delete index.php from CI url" ....But i have been working with all tips, including with my htaccess code:

Code:

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

and i still have a problem with index.php, and this means all request cannot work if without index.php. I have a controller class "register" and im also add some url suffix with ".html" so all request url will be "http://localhost/ci/index.php/register.html" <-- a strange url huh? :down: ..This url is working well, but if i try to delete index.php, then i've got some error message.

I'm also done with config.php, with means i have change line 26 for $config['index_page'] with an empty string. But it still cannot work.

Please try help me, i have read many thread in this forum but nothing find some helpfull information for me