Hi, I am building my own computer. It runs on an AMD 64 3500+. I know very little about running systems. I've heard from some people that Linux is better for security. I also heard it is difficult to use, and taking a course on it is recomended. Would it be hard to learn how to use it? Also, what about Windows Xp Home or Pro? I guess pro is better, but is it really worth extra money? I just need some advice on what to get, THANKS