Linux Box

My windows recovery CD seems to be pretty damaged and I’m not planning on buying new CD.I know that linux is free,so I would like try it but I don’t know how to install it.Can anyone explain me step-by-step?I will really appreciate it.

I thoroughly recommend Linux Mint 9 LTS which is built upon Ubuntu 10.04 LTS (Long Term Support) its easy to install and easy to use plus it comes with much of the software you are likely to need preinstalled

Linux Mint 9 LTS Download
http://www.linuxmint.com/edition.php?id=52

Linux Mint 9 LTS Installation Guide
http://www.linuxbsdos.com/2009/12/03/linux-mint-8-installation-guide/

Linux Mint 9 LTS Release Notes/User Guide
http://www.linuxmint.com/rel_isadora.php

You download the ISO. image of Linux Mint 9 LTS then you need to create a Bootable LiveCD for installation
https://help.ubuntu.com/community/BurningIsoHowto

Linux Mint 9 LTS can also be run direct from the LiveCD from Boot without touching your Hard Drive

LUg.

I know in DOS you do dir /s for the entire system. What is the linux equivalent ?

ls -Ra /

That is LiSt Recursively All files starting with / (the top level).