Hello I am using now windows 10 operating system which is devloped by microsoft so it’s obiasly sequre and safe to use. in windows 10 cortana is the vary use full feacther it make my compuet to real human. as well as so many feacther are avilable in windows 10 like windows store, conect windows phone, gaming application, inbilt vpn facility, malti screen etc. and mostly all dily roting softwer application avilable in store like video player skype, facebook etc.