Description:
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I install Xampp xampp-win32-1.7.0-installer. Php version is 5.2.8, Mysql version 5.1.30, Apache version 2.2.11

I'm using PDO to query my database.
As i query out a result of more than one column, apache restart, and in log i read :

[Thu Aug 06 17:53:23 2009] [notice] cannot use a full URL in a 401 ErrorDocument directive --- ignoring!
[Thu Aug 06 17:53:31 2009] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Thu Aug 06 17:53:31 2009] [notice] Digest: generating secret for digest authentication ...
[Thu Aug 06 17:53:31 2009] [notice] Digest: done

Reproduce code:
---------------
This produces an error :
<?php
$pdo = new PDO('mysql:host=localhost;dbname=data','user','pass');
$result = $pdo->query("SELECT login, pass FROM admin");
$result->setFetchMode(PDO::FETCH_OBJ);
foreach ($result AS $line){
  echo '<label class="nom">'.$line->login.'</label>';
  echo '<label class="rates">'.$line->pass.'</label>';
}
?>

Expected result:
----------------
I hope this will print data, but not. 

I run this without problem :
<?php
$pdo = new PDO('mysql:host=localhost;dbname=data','user','pass');
$result = $pdo->query("SELECT COUNT(*) as Me FROM admin");
$result->setFetchMode(PDO::FETCH_OBJ);
foreach ($result AS $line){
  echo '<label class="nom">'.$line->Me.'</label>';
}
?>

It prints the exact number.

Actual result:
--------------
The browser seems to load the page, but i have a prompt Apache HTTP encouter an error and must... and the log is what i show on the top.

Can you help me please ?