How to Remove Nariabox for Good – Guide to Get Rid of Browser Hijacker Completely

Need help removing Nariabox.com virus from opera browser but all I’ve searched there were thousands of articles about removing this virus from explorer, chrome etc, but not OPERA, not even SINGLE article about that.. and it does NOT apply same solution to opera as other articles said about other browsers. so does a person exist who knows how to remove Nariabox.com search from opera?
Somehow I managed to accidentally download Nariabox.com  and apparently it’s really dangerous and should be removed immediately. But I don’t know how to remove it :/I’ve been working on it for ages and it just won’t go away. Norton security isn’t picking it up as a risk either so I can’t use Nariabox.com. Please help!