Dude, seriously, it's what I do as a career. NEVER, ever had it on my computer (currently). On my older computer, before I knew what was up, I had it a lot. Since that's the main thing I work on where I work, I know how to prevent it and how to get rid of it. I scan my computer once every month. The main thing to know is to not download most free programs (there's a reason they are free) and to basically not browse porn sites (most of them anyway
) With those two programs, you'll keep your shit squeaky clean.