Simply re-entering the correct Internet preferences is not enough to prevent a browser from being redirected to Searchmine.net. The reason is prosaic: you are dealing with a virus rather than a misconfiguration glitch. Obviously, to get rid of Searchmine.net for good you need to address the security issue first. Start with a virus hunt. In other words, you should scrutinize your installed apps, Login Items, and browser extensions for an object that got there behind your back. Make sure you delete all suspicious entries you manage to find. This part of the repair can be done manually or through the use of an automatic removal tool, the latter option being more effective and preferable if you aren’t very tech-savvy. It’s not until the infection has been completely eliminated that you can customize your web browser so that it returns the right sites when you perform web search. In some cases, it may be necessary to reset the browser to its original state and then define the appropriate defaults.