Hello I can't login as admin because the captcha is not visible, i see only a little red cross. I have uploaded a fresh captcha.php but that was not the solution. Please help.
Post a link to your gallery - it is a forum rule.
Search and read this thread http://forum.coppermine-gallery.net/index.php/topic,36319.0.htm (http://forum.coppermine-gallery.net/index.php/topic,36319.0.htm)l
Not related to initial install - moving accordingly.
In the thread posted above there is information on how to disable this plugin using phpmyadmin. Once you can login, post a link to your gallery if you need further help getting the capcha to appear.