Those screenshots were helpful.
Looks like you are booting from Fedora 12 live, right?
I suspect you are having problems with the new open source nVidia drivers (Nouveau drivers) which were introduced in F12 and continue with F13. Imo, nVidia is the best card to use in Linux but the new open source drivers are a little buggy. I use the drivers supplied by nVidia and provided via Fedora's 3rd party driver repository (rpmfusion). Those drivers work great but you can't get at them with the Live CD. You have to install Fedora first.
You're getting to the desktop but it appears you just can't see the taskbars (panels) on the top and bottom. It almost looks you're viewing just a section (or window) of the desktop. This is probably due to an issue with the new open source Nouveau drivers. While I don't think it's the problem, can you adjust the height adjustment on the monitor to see those task bars? Just tossing that one out there.
Having said all that, you should be able to boot from the Live CD using the generic vesa drivers.
From the screen below..

1) Hit the space bar and you'll be presented with a boot menu.
2) Press the tab key and you'll be able to edit the boot parameters
3) Add the following to the end of that line.
xdriver=vesa nomodeset
4) Press the <Enter> key and the live CD should boot using the generic vesa video driver.
I tested this out on my nvidia box with the Fedora 13 Live CD.
Hopefully, that will allow you to view the full desktop and test drive the CD. Running an OS from a CD is very slow so take that into consideration when evaluating.
On a side note, if you really want to permanently run and use Linux from a CD,
Puppy Linux is the way to go. It runs out of ramdisk so it's fast. It's not as slick and as cutting edge as Fedora or Ubuntu, but it's a nice little distro for running from a CD. You can also run Fedora from a USB thumb drive, if you BIOS supports booting from a USB device. However, the best Linux experience is to run a full blown distro from your hard drive.