Counterize doesn't let me log in into wordpress

Everything was working smoothly until all of the sudden this letters started popping out on top of my website: http://www.estebancalderon.com/pro
After that happened, now I can’t even log in into my wordpress account to deactivate the plugin. I have no idea how this happen. I don’t remember which version of wordpress I have.. I think it was one version behind the last one. Maybe it updated or something without my permission.. I don’t know if that’s even possible…
This used to be my login address: http://www.estebancalderon.com/pro/wp-admin/
Any ideas? I’m pretty desperate.

http://wordpress.org/extend/plugins/counterize/