rewrite rule setting in nginx

I install nginx 1.0.0 and i installed it /usr/local/nginx1.0.0/.
and I try to modify /usr/local/nginx1.0.0/cont/nginx.conf file.

I just copy default file. and replace server_name and root path

and I connected example.com -> it works (there is nginx working message.)

but I connected www.example.com -> it is not working.(there is 404 Not Found message.)

and url is =

http://www.example.com/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/index.php/

and I try to server_name => example.com *.example.com (but same problum)

this is my nginx.conf code.
am i wrong config? or wrong install?

server {
        listen       80;
        server_name  .example.com;


        location / {
            root   html;
            index  index.html index.htm;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }


      location ~ \.php$ {
            root           html;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  html$fastcgi_script_name;
            include        fastcgi_params;
        }

        location ~ /\.ht {

            deny  all;
        }
    }