run codeigniter with windows server

i have windows server and i can't run my script on it
this error is 500 server error
please help
GoldenFingershi, 
i have windows server and i can't run my script on it
this error "Not Found"
htaccess
<IfModule mod_rewrite.c>

  RewriteEngine On
  RewriteBase /
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
  ErrorDocument 404 /index.php
</IfModule>
the problem with index.php
when i enter to website without index.php/ not work
i don't want index.php/