WordPress MU

I have problem "Internal Server Error" just i started installation with command http://sipil93.com/blog/index.php

Here is config of htaccess.dist

RewriteEngine On
RewriteBase /blog/

#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

<Directory>
Options FollowSymLinks
AllowOverride FileInfo Options
</Directory>

Anybod could help me to solve this problem?

First thing to do is review your server error logs.

May want to skim this as well:

http://codex.wordpress.org/Debugging_WPMU