Help with installing viral script

Can anyone help me I get this error when I try to go to my site


Warning: require_once(D:/Hosting/6417411/html/data/config.php) [function.require-once]: failed to open stream: No such file or directory in D:\Hosting\6417411\html\admin.php on line 13

Fatal error: require_once() [function.require]: Failed opening required 'D:/Hosting/6417411/html/data/config.php' (include_path='.;C:\php5\pear') in D:\Hosting\6417411\html\admin.php on line 13