I got hijacked a few years ago, It was a pain. Had to go into the hidden files and the registry to remove it. We use Norton on 3 computers and Microsoft Security Essentials on the others. I personally like both these programs. Also use Super Anti Spyware and spybot S&D. Despite all this I still got hijacked. I use the internet heavily since I use my computer for work when at home and I do a lot of research. Other than that 1 time I have had no other problems for years. The MAC is a good idea though, just a whole new learning curve.