testd?

when I type
http://www.airfaretoacapulco.com/asd.txt
I get your correct 404 page. I suggest looking in your root directory for a file like index.html (index.php is the only index page you want) and find out how it got there. If your index.php itself got rewritten then you are in worse trouble. If someone can add files to your root directory then you need to find out how and fix it. As a minimum, change your host password and ftp password and WordPress password.