www.distrowatch.com is the place to go to see all the newest and most interesting distros of Linux. They maintain links to all the listed distributions of Linux. As I said, my personal recommendation for newbies is ubuntu, which you can reach directly at www.ubuntu.org. No matter which distro you choose, make sure it says 'live' in the title and it will be what you want (you can also install from a live CD / DVD if you later choose to do so, just click 'install' and away it goes). You will be downloading an ISO file. I presume you know how to burn a CD/DVD from an ISO file, right? Just burn a disk, shove it in the CD/DVD player, reboot. Set your PC to boot from the CD/DVD first (which is often the default selection anyway) and that way it will look to find your live CD/DVD in the drive before booting the hard drive that's in it currently.
Thanks Wigwam. Yes, I know how to burn a CD from and ISO file, that's the easy part. Heck, I think Nero has that automated, I just tell it and it does it.:thmbsp: