Everwhere “Array”: title, description, post password, post slug, etc.

I just installed a WP Blog and everywhere there are values with “array”. Nearly every field is filled with “array”. And there are about 20 plugins called “array”. And the users page is empty. If i update the .htacces like told in the section “permalinks” no page is available. Even the suggested htaccess entry shows “array” grrr:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase Array/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . Array/index.php [L]
</IfModule>

Is this some sort of _root-thing?
Thank you!