Hi, I currently have a Macbook Pro Retina 13in. running the latest OSX El Capitan. Been having some issues with freezing lately and not sure if it was a result of virus or malware. I currently run Malwarebytes and CCleaner every so often to clear out junk files. I was wondering if an antivirus software is needed for Mac OSX and if so, what are some free suggestions? - b1gal