TOPIC: Captcha ALWAYS wrong.. help me

Hi friends, I'm having a problem and it's making me crazy..
I've installed JoomlaComment and set the captcha option to be inserted at the end, BUUUUT when I go, post a comment and fill the captcha field with the correct code it says:

Codigo antispam incorrecto. Porfavor introduce el codigo que puedes leer en la imagen

or in english: Incorrect antispam code, please enter the code u can read at image... or something like that. You get it. My site is in spanish..

I dont know what to do or what may be causing this!!!
Please guys, I know u can help me..

U can watch the error trying to post a comment here:

http://presentaciones-powerpoint.com/content/view/71/43/

Thanks!!

Josue.

I see. Check your database collation - it should be utf8_general_ci and also try the english language file.