fresh install does not work

[nisso]

Hi,

Just install roundcube-0.1.20070608, then mysql tables and so on...
I've placed roundcube install dir under /usr/local/www/data, which in my apache root folder.
Got a login screen, but when I pass name/password, my browser receive error: "The requested URL /roundcube/ was not found on this server.". My apache logfile says: "File does not exist: /usr/local/www/data/roundcube//".... actually my files are in /usr/local/www/data/roundcube/.
Make some changes in roundcube config files and httpd.conf, but no success!
My system is 5.5-STABLE FreeBSD, Apache 1.3.37, php5-5.1.6, mysql-server-4.1.21

Please, help me to solve this!
Excuse me for my bad English and thanks in advance.