in your config.php must be:
$captcha_enable = 0;
$captcha_enable_comments = 0;
$captcha_enable_upload = 0;
$captcha_enable_registration = 0;
$captcha_enable_postcards = 0;
your Template "wallpaper" isnīt a Template for version 1.7.3
it is a Template for 1.7 / 1.7.1 / 1.7.2
or, you create new files, look at this site:
http://www.4homepages.de/forum/index.php?topic=13732.new#newChanged Templates / New Templates / Language ...