What software(s) should I install on new system(with Linux as a OS) to prevent it from getting hacked?

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http://unix.stackexchange.com – I am switching to new system with a OS using Linux.I will be using another system which has windows ultimate which is hacked.I am being cyber bullied. I have given a reference to this as a question on stackexchange. Now I want to install some softwares on my system with linux that I havnt started it which can prevent from being hacked or being traced in any way. A fear that I have is -If I make a new email,it may be traced or hacked easily unless I contact old emails which I will not. http://security.stackexchange.com/questions/18849/what-do-i-need-to-worr... (HowTos)