Fatal error: admin-functions and upgrade-functions

I’m trying to install a complete new version of WP onto my log. But all I get after uploading all the files in the right directory is this message, when I try to run the install.php:

Warning: require_once(ABSPATH/wp-admin/admin-functions.php) [function.require-once]: failed to open stream: No such file or directory in /storage/…../public/sites/www.bruddstyker.nl/wp/wp-admin/upgrade-functions.php on line 5

Fatal error: require_once() [function.require]: Failed opening required ‘ABSPATH/wp-admin/admin-functions.php’ (include_path=’.:/usr/share/php:/usr/share/pear’) in /storage/…../public/sites/www.bruddstyker.nl/wp/wp-admin/upgrade-functions.php on line 5

I’ve checked and rechecked in several FTP-programs if all the files are there and in the right place. And they are. I’ve tried it with a new database. And still get the same message. And I’ve tried it with the WP-version translated to Dutch (that worked before on another log) and the original english version.

When I take a look at my log when I get the message above, the log states:

Fatal error: Call to undefined function wp() in /storage/…../public/sites/www.bruddstyker.nl/wp/wp-blog-header.php on line 16

I’ve removed the installation now, because the password of my database was showing. And that’s not what I want. But is there someone who can help me solve this problem? I’d really be grateful!