how to remove wp-stats malware in wordpress?

In my wordpress the follwing code added automatically in the footer.

<script src="http://stats.wordpress.com/e-201319.js" type="text/javascript"></script>
<script type="text/javascript">
st_go({v:'ext',j:'1:1.2.2',blog:'31704568',post:'0'});
var load_cmc = function(){linktracker_init(31704568,0,2);};
if ( typeof addLoadEvent != 'undefined' ) addLoadEvent(load_cmc);
else load_cmc();
</script>

Also i can found wp-counts.php and wp-apps.php in the folder.
The google block the website due to the malware code.

I cant able to clear this malware, since i was new to wordpress can anyone help me to clear this issue.

Thanks in advance,
John