mod_rewrite

hi guys, i'm new to codeigniter, i've been reading the instructions to use this framework properly, but I can't seem to make the .htaccess to work.  

this is in my .htaccess:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /newbie/

RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /index.php?/$1 [L]

RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ /index.php?/$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/$1 [L]
</IfModule>

<IfModule !mod_rewrite.c>

ErrorDocument 404 /index.php
</IfModule>

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i have enable mod_rewrite in xampp already, still did not work.

I would really appreciate it if someone would help me.