That may get a little complicated without shell knowledge. But I'll try.
I've just searched for a "small" live CD:
http://trinityhome.org/trk/download.php
That's around 80MB but I have never tried that CD. I use for such tasks Knoppix:
http://www.knopper.net/knoppix-mirrors/index-en.html
Around 650MB.
Both ones need to be burned on a real CD. Then reboot your computer using your new CD. Just use default settings. But under Trinity you may have to select GUI mode - runlevel 5 or graphical login - I don't know the option there.
When your desktop has booted, start a shell: Under Knoppix hit the "start" - Button (under KDE it is a K) and select Run command. Type "konsole" and hit enter. There's a menu entry too, but I can't remember the exact name.
Now you have a shell / command line: Type
sudu su
(and hit enter) to become the super user (root - somewhat like administrator). Afterwards
qtparted
and again enter. Now the partition editor will start. There resize your partition. For Linux you should at least have 10GB of free space.
Save, quit, reboot and start from your Linux CD. What distribution do you plan to use?
If that sounds to difficult for the moment you can also try a "virtual" Linux: Download the VMWare Player from http://www.vmware.com and for example http://www.vmware.com/vmtn/vm/ubuntu.html
Do you have a second PC to ask questions while you are installing? If yes you can ask me also by Jabber (or ICQ if there's no other way...)
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