R.search.yahoo.com is a subdomain related to Yahoo Company. You may experience the problem of search engine redirection through r.search.yahoo.com, in spite of the fact that you previously had some other search provider set as the default one. This could happen if your search settings were modified by some browser hijacker. It is obvious that many browser hijackers use Yahoo Search Engine as one of the sources for the search results. This surely doesn’t mean that Yahoo is related to any of these hijackers, this simply means that if you aren’t satisfied with redirection through r.search.yahoo.com you need to fix this…