Hi, Recently I was visiting some dodgy websites....trying to find games for my samsung galaxy S4 (I used to have an iphone 3gs but decided to change and now I have some dodgy sites that keep popping up and downloading what I believe is a virus although discguised as MXPLAYER...which automatically starts to download. How can I make sure my Mac Book Pro has no viruses or issues and how can I clean it and clean safari? Second question is I have very limited internet where I live but as I am going on Holiday I can use it all up before I go.....I want to use it to upgrade to NEW OS for MAC, its free right? Should I upgrade and what should I do before? I know backup is smart...but it will take ages to back up my machine right? What steps do you recommend and anything to be on the look out for? Thanks! Great place with loads of helpful people!