[ubuntu] Help booting from USB

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http://ubuntuforums.org – Hi guys, My computer went haywire and refused to start up. I really thought it was ****** but my friend suggested booting from USB with Linux (Ubuntu) as a way to potentially get in and retrive files I thought I'd lost. I downloaded the installer from pendrivelinux.com and managed to boot up off the USB from the BIOS. I was excited to see Ubuntu seemed to have actually loaded! But now I have what I assume is the default Ubuntu desktop and it's asking for login username and password. I never had a username and password on my XP before the crash and i don't know how to get past this screen (Hardware)