Installing Drupal

Sometimes such error appears on my site:

Hey everybody.
I just found drupal.org and installed it on my local Webserver - great! It's really powerful but still pretty easy to use.
I'm developing websites just for the fun of it and for my school. Since I'm from Germany most of the people using/accessing my page(s) are German, too -- therefor I'd prefer a German interface.
Well, OK, I found the localization module which allows me to translate everything string by string but I wonder if there is a complete German translation and if there is one wether I could use it (and how). :)

Thanks in advance.

I'm working on a digest module which is based on notify.module.
My idea is that, in user profile, there is a select field where you specify 'subscribe' o 'dont subscribe'.
A cron module selects from DB all users that have this field set to 'subscribe' and sends newsletter, with the same logic as notify.module.

My problem is that I don't know how to retrieve that field from user profile.

Thanks for your help.

If I try and save my user information on my installation of Drupal PHP crashes (Application error) - this is a new install and I'm logged on as the administrator of the Drupal site

I am getting the error message:

warning: MS SQL: Bad row offset in C:\PHP\pear\DB\mssql.php on line 169.

This is a new installation and as far as I know, everything is configured properly. Anyone got any ideas?

I'm looking to modify the message_access function to something a bit more friendlier than "You are not authorized to access this page."

Where is this function? I've been looking all over my drupal installation for it. Thanks!