Help with installing

[Christoffer Alenskog Berg]

Hi!
I've begun studying physics and like to install Octave on my computer so that I can use it at home as well as in school, I'm having difficulties to do so since it isn't a normal program and I'm new to programming, octave etc.
I would appreciate a link or description that could help me install this software.
 
Thanks! /Christoffer