Hello, I have two questions about this windows 10. Windows 10 comes with Windows defender. I was told that was the only security I needed because it will clash with anything else. But is this defender secure enough? But other people I know have something else and they are all different. So can someone please tell me if I should purchase another anti virus and what one goes with Windows 10. Also what other browsers will work with windows 10. I am having nothing but trouble with Firefox. Appreciate any help.