I try to install magento for the first time.

• I've created the database with the name "project"

• in my C:\Zend\Apache2\conf\httpd.conf I added on the end:

  <Directory "C:\Zend\Apche2\htdocs\project">
      Options Indexes FollowSymLinks
      AllowOverride All
      Order allow,deny
      Allow from all
  </Directory>
  

• in my ZendServer/Server Setup/Extensions: PDO_MySQL, simplexml, mcrypt, hash, GD, DOM, iconv, curl, SOAP are on

• in C:\Zend\ZendServer\etc\php.ini I set:

safe_mode = Off ;<-- was set to off
...
memory_limit = 512M; Maximum amount of memory a script may consume (128MB)

After step "Configuration" of magento installation (with Use Web Server (Apache) Rewrites enabled) I get:

• Internal Server Error

My database is full of tables (that schould be ok)
My Zend Server shows:

27-Oct 06:55    6    Severe Slow Request Execution (Absolute)    http://localhost/project/index.php/install/wizard/installDb/    Critical Open
27-Oct 06:55    4    Fatal PHP Error    C:\Zend\Apache2\htdocs\project\lib\Varien\Db\Adapter\Pdo\Mysql.php        Critical    Open
27-Oct 06:55    5    Slow Function Execution    curl_exec        Warning    Open
27-Oct 06:55    5    Slow Request Execution (Absolute)    http://localhost/project/index.php/install/wizard/configPost/

What can be wrong?