I sympathise with you as I have the same problem and it seems that Malwarebytes and many other removers/disinfecters can't find it never mind get rid of it. This is what I get when I search in Google address bar http://us.yhs4.search.yahoo.com/ and now I am getting Bing turn up in IE. It is impossible to remove them as they do not show up when you go to Internet Options to set the search engines. I did a search on http://us.yhs4.search.yahoo.com/ and got to this page........... which has a removal method. It is a bit too complicated for me and I am not sure if it is legit and if it would work. Can anyone confirm that this might work?? This is the link http://blog.mitechmate.com/remove-us-yhs4-search-yahoo-com-redirect-fake-yahoo-search-removal-guide/ I have also tried Avast Browser tool bar removal............ doesn't work Panda removal tool.................. doesn't work.. WTF ! there must be something that will fix it.