Which iso did you download and install on the USB-drive using LiveUSB-Creator?
Also, was it this LiveUSB-Creator
? (They are all named very similar.)
Can you describe your problem more precisely?
Can you boot your computer from the LiveUSB or is there already a problem with that?
Stick the LiveUSB into your computer and turn the computer on. Right when the first text appears in Bios (white text on black background) press the F12 key and you should get a menu from which you can select from which drive to boot. Select the USB-device and the computer will boot from the LiveUSB and not your hard drive.
You then arrive at a desktop where there is a desktop-symbol "Install Fedora 17" or something like that. Klicking that, you can install Fedora 17 on your computers hard drive.
Was that your problem, or did you already get that far and had a problem later?
I am sorry if I am asking too simple things, but I don't know how much you already know about these things.