Last year I but a MacBook Pro for school and the main reason I bought a Mac over a PC is because I didn't need Antivirus (Even though now that I switched from PC i'm never going back ). But just recently I went to orientation for college and I was told that to use the schools internet everyone has to have antivirus software on the computer, even if they have a Mac. This mad me upset but I guess I have to put antivirus software on my computer. The school will install antivirus on your computer (Symantec Endpoint) if you want to pay, but I don't want to pay. If you want free antivirus they recommend ClamXav. So my question is what free antivirus does everyone recommend? I want free antivirus that won't slow my computer down.