my site says 404 not found and it worked earlier what do i do?

I want to become a memebr on taylor-lautner.com however it hasnt sent me a verification email like it said it would :S , how can this be resolved ?

Hi! I’ve just discovered that error trying to access my admin site
“Warning: Cannot modify header information – headers already sent by (output started at /home/magical/public_html/wp-settings.php:692) in /home/magical/public_html/wp-includes/pluggable.php on line 865″

Also if I try to enter my web as an user… I see rong thing in it like extranges characters and une unexustant heder that alter all my site aspect…

Things like that:
SÃ
más, sólo
ómica, tambié
The extrange characters seem ti be replacing characters like á, é, í… but still don’t know why this hapend because the web is online almost a year now and the problem is very recent

Any problem with servers or something?

what the MySQL Database Name for Coppermine please ?

more on line

hi i would like to make this site and would also like to know how things are is free and if I have to register in order to have this as my site. thanks http://www.bellathorneweb.org

Dear FanFusion.org,
I would like to adopt one site:1)www.dd-lovato.com.But I want to know if I have to register in order to have this as my site.