Ok, in which case you need ..
RewriteRule ^ /index.php
That will send all traffc to the dir it is in to index.php. That's assuming you want it to send everyone to index no matter what file within that dir they are trying to access.
Or .. are you trying to set an index on the dir? In which case .htaccess file is not important, just use what you have already got ...
... though make sure you are setting Directory Index in the right place in http.conf. After you have done that, if it is still not working you will need to restart Apache.
One of those is bound to be what you are after, right?