Thanks, that was really helpful. I've downloaded Microsoft Security Essentials, but I can't run the .exe for some reason. It makes me choose a program; I choose winzip, but it still doesn't work... what should I do?
Because people don't make them for Macs. Because no one uses Macs
@The rest of your suggestions, I will try my best...
Edit 2: Figured out the .exe... thanks again people.