I am a new comer to wordpress, however manged to set up it and make up a blog for any friend about last month. I up-to-date word press an it's giving me this error:

http://blog.make-upbytalitha.com/

I am certain all files exist.

Thank you for any help

This is probably since you have installed wordpress in to the wwwroot rather than a sub-directory. Wordpress automatically assumes it will likely be set up in a sub-directory.

To resolve this issue, customize the index.php file the following in case your WordPress installation is running inside your root directory. You only have to alter the following line:

require('./wp-blog-header.php');

For this:

require('wp-blog-header.php');

After which, everything ought to be working all right.