Complete guide to Installing Ubuntu Linux inside of Windows for a complete Linux Novice, Timeline of steps are below.
Timeline
0.43 Download Wubi windows installer from Ubuntu website
2.20 Install Ubuntu inside of Windows 7 with Wubi
4.10 Booting into Ubuntu
5.19 Dual Boot Menu Ubuntu or Windows 7
6.09 Uninstall Ubuntu
Although this is a very easy and safe method to install Ubuntu it is always wise to back up your files first, However I have never had a problem with Wubi.
Music is Dunbar Nights by Graham Woodward Copyright 2008.