How to Sniff People's Password? (A hacking guide with Cain & Abel - ARP POISONING METHOD)

First, you must have the Cain & Abel program, to download the click here.
Install the program, then run it.

How to Enable the Disabled Registry Editor?

If you don't know what a Registry Editor is then read this article on wikipedia (The definition of Registry Editor).
This is the main window of the Registry Editor in Windows XP.

How to Install Ubuntu? (A Complete Guide + screenshots)

First of all, I want give you a short description what a Ubuntu is.

From wikipedia we can find that Ubuntu (pronounced /uˈbuntuː/) is a computer operating system based on the Debian GNU/Linux distribution and distributed as free and open source software. It is named after the Southern African philosophy of Ubuntu ("humanity towards others").