Option One (Full installation)
I thoroughly recommend Linux Mint 8 Main Edition which is built upon the outstanding Ubuntu 9.10 Its easy to install and easy to use plus it comes with much of the software you are likely to need preinstalled
Linux Mint 8 Download
http://www.linuxmint.com/edition.php?id=44
The Perfect Desktop - Linux Mint 8 (Helena) Installation
http://www.howtoforge.com/the-perfect-desktop-linux-mint-8-helena
Linux Mint 8 Helena User Guide
http://www.scribd.com/doc/23787138/Linux-Mint-8-Helena-User-Guide
You download the ISO. image of Linux Mint 8 then you need to create a Bootable LiveCD for installation
Linux Mint 8 can also be run direct from the LiveCD from Booting up without touching your Hard Drive
Option Two (Install Ubuntu inside Windows XP Vista and Win 7 also applies to Linux Mint see below)
Installing Ubuntu as a dual-boot with Windows without partitioning
http://www.psychocats.net/ubuntu/wubi
Linux Mint 7 has a similar feature to Wubi called mint4win and the directions given above for Wubi can be followed (mint4win is not available for Linux Mint 8)
http://duncsweb.com/2009/09/27/mint4win-a-wubi-based-installer-of-linux-mint/
Linux Mint 7 Download
http://www.linuxmint.com/edition.php?id=38
Linux Mint 7 Gloria User Guide
http://www.scribd.com/doc/15884753/Linux-Mint-7-Gloria-User-Guide
Linux Mint 7 can be run straight from the LiveCD without touching your Hard drive
Option Three (LiveCD)
Here the possibilities are endless as you can try out as many different Linux distros. until you find the one thats right for you DISTROWATCH.COM gives full listings (second lists the major distributions)
http://distrowatch.com/
Major Linux Distributions
http://distrowatch.com/dwres.php?resource=major
LUg.