moving moodle from windows to red hat

I've make my site using moodle in Windows XP. Then I wanna copying it to Linux (I use Red Hat Enterprise AS 4). I put 'moodle' and 'moodledata' directory to /opt/lampp/htdocs. And the database 'moodle' to /opt/lampp/var/mysql. When I open my site, it's appear exactly as in windows. But I can't login even if I use admin user. How to solve this problem. Help me please. Thanks.

You should't use MoodleDocs for assistance, use forums for that !

For your problem, you should check if all write permissions are Ok.