Installing Drupal

This is my first drupal install attempt, and I'm stuck with this return when I point my browser to http://www.learning-communities.net :

Fatal error: Call to undefined function: user_access() in /home/chay3/public_html/includes/common.inc on line 1914

I just downloaded the German translation file (de.po), but I don't know where to place it in my web directory. Where can I enable international language support? I did not find any hint in the documentation.

Your help is greatly appreciated.

With best regards,

Klaus Dohmen
Mittweida University, Germany

I get the following error:
/bin/sh: line 1: 0: command not found

whenever I try to cron it using the command

Plesae help

http://www.bluxstudios.net/drupal/

Can anyone give me some directions to upgrade from 4.2 to 4.5. I see a lot of 4.3 to 4.4 or 4.4 to 4.5. Do I have to upgrade from 4.2 to 4.3 to 4.4 then to 4.5. Any help is appreaciated. Thanks.

When I try to log in for the first time, I get the following problem:

warning: Cannot modify header information - headers already sent by (output started at
/home2/bluxstud/public_html/drupal/includes/conf.php:55) in /home2/bluxstud/public_html/drupal/includes/common.inc on line 160.

warning: Cannot modify header information - headers already sent by (output started at /home2/bluxstud/public_html/drupal/includes/conf.php:55) in /home2/bluxstud/public_html/drupal/modules/user.module on line 799.

Hello, I have just installed the latest version of Drupal and get the following error whenever I go into 'settings' in the menu or try to configure a theme: 'The directory files does not exist.'The directory files does not exist'

at the top of the page there is the following error message:
warning: mkdir() failed (Permission denied) in /web/sites/xx/xxx/www.xxxxx.com/includes/file.inc on line 77