Optmz online and oursurfing malware hijacking the browser

Hi,
I tried various method to remove this malware which redirects the browser to optmz.online and then few other sites. I tried it through adwcleaner and some other cleaner software. I also tried to remove the registry keys of oursurfing (Optmz was not there) . But on restart the keys seem to be not deleted. Kindly help