I just wanted to try out Ubuntu on my computer without installing it first. I am running Windows XP and have the CD ISO image on a CD. The ISO was verified on download via winMD5Sum and on burning via Ubuntu start-up screen. I am trying to do the Ubuntu option "Try Ubuntu without making any changes to your computer" when I boot-up my computer, with the Ubuntu ISO CD in the CD drive. Ubuntu loads, then it asks me for my Username and Password; but I did not install Ubuntu so there are none of these. How do I get past this to try Ubuntu ? Thanks.