I just installed ZenPhoto... ot at least I tried. When I try to access setup.php it gives me a 500 Internal Srver Error. What's wrong?

My settings... PHP 4.1.2, safe_mode ON, MySQL, GD 1.6.2 or higher, Apache/1.3.31 (Unix) (server software)

It's got something do do with apache and PHP, probably not zenphoto...

do other PHP scripts work fine?

try deleting the .htaccess file and turning off mod_rewrite in the config.php?