Whereabouts do I find if, I have or need a Virus/Firewall,Spam checker in my newly purchased Mac Book 13 inch white laptop. I am a PC Windows convert but try as I may I cannot find anything that tells me about the above. When I first opened my new PC it screamed at me to to subscribe or buy the said software. I have only had the laptop for a couple of days and have spent most of that time trying to find info re Viruses. Very frustrated .trying to be a convert Mac Owner