WordPress installation problem!

I get this error message after installing wordpress. What Does it mean?
This is my first installation of wordpress.

Error Message:

Warning: main(./includes/upgrade.php): failed to open stream: No such file or directory in /home/www/blog.redzonemt.co.cc/wp-admin/install.php on line 10

Fatal error: main(): Failed opening required ‘./includes/upgrade.php’ (include_path=’.:/usr/local/lib/php’) in /home/www/blog.redzonemt.co.cc/wp-admin/install.php on line 10