installing of Drupal not work, please help

Hi;
I have tried to install durpal, but so far no luck, and stuck in the first step.
I already have a database driven site ( php, mysql) and works fine, I can access my host using Cpanel, and also using PHP My admin, so no problem of db access.
so here is what I have done, using php my admin I have made a DB, "blogdb" ( no table inside),
DB name: blogdb
username: myblog
password: myblog2003

I also made a subdomain of my site with the name of blog
http://blog.mysite.com

and on the conf.php file I have changed some lines as:

--------------------------------------------

// $Id: conf.php,v 1.26 2003/03/16 07:02:16 dries Exp $

#
# Database settings:
#
# Note that the $db_url variable gets parsed using PHP's built-in
# URL parser (i.e. using the "parse_url()" function) so make sure
# not to confuse the parser. In practice, you should avoid using
# special characters that are not used in "normal" URLs either.
# That is, the use of ':', '/', '@', '?', '=' and '#', ''', '"',
# and so on is likely to confuse the parser; use alpha-numerical
# characters instead.

$db_url = "mysql://myblog:myblog2003@localhost/blogdb";
# $db_url = "pgsql://user:password@hostname/database";
# $db_url = "mssql://user:password@hostname/database";

$db_url = "mysql://myblog:myblog2003@localhost/blogdb";

#
# Base URL:
#
# The URL of your website's main page. It is not allowed to have
# a trailing slash; Drupal will add it for you.
#
$base_url = "http://blog.mysite.com";

#
# PHP settings:
#
# To see what PHP settings are known to work well, take a look at
# the .htaccesss file in Drupal's root directory. If you get
# unexcepted warnings or errors, double-check your PHP settings.

# If required, update PHP's include path to include your PEAR directory:
// ini_set("include_path", ".:/path/to/pear");

#
# Languages / translation / internationalization:
#
# The first language listed in this associative array will
# automatically become the default language. You can add a language
# but make sure your SQL table, called locales is updated
# appropriately.
$languages = array("en" => "english");

#
# Custom navigation links:
#
# Custom navigation links override the standard page links offered
# by most Drupal modules. Administrators may add/remove/reorder all
# links here. These links are typically displayed in a row near the
# top of every page.
// $custom_links = array(
// "home",
// "journal",
// "articles");

------------------------------------------------------
this is the exacxt file change except my website name, I also took off the php code from beginning and end. ( eitherwise the code does not show up)

so when I run install, nothing shows up, empty space.

another thing which I did not do anything with,
in the manual it saya something about change some value or adding the following to
.htaccess file,

" magic_quotes_gpc 0
session.save_handler user
session.cache_limiter none
"

but I am not sure which .htaccess
I run a webpage driven page, and there is a file there, with this name, there is also such a file comes with the durpal package. I don't know which one I should mess with.

anyone can help Please?

thanks.