Site Locked

Hello all,
I have a very big problem!

Saturday, trying to index my website, I’ve changed a detail into General Setting: I’ve removed “www” from WordPress address and site address.
I know that it was an insane choice, but, after doing that, the site has locked my access: I’ve put my admin data into login page, but nothing happened.
If you go to http://www.fotoaiello.it, suddenly appears an alert about some page redirect.
From FTP, I’ve overwrited WordPress data.. but, again, nothing happened and the problem is still here.

I really don’t know what else I can do.
Please, please, please, is there anyone that could help me?

Thank you in advance.