Install Ubuntu without burning LiveCD from Windows 7 dual-boot(not wubi)

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http://ubuntuguide.net – Before, my desktop pc has Windows Xp, Windows 7, and Ubuntu 11.04 ternary-boot systems installed on one hard disk. Last night I deleted whole Ubuntu partition by accident and then messed up Windows configuration files. Nothing could be more terrible! Finally, I decided to reinstall Windows7, Ubuntu 11.04 dual boot and give up XP. I’m lazy in burning CDs/DVDs, so I used to do it using .iso image and manage to boot into live-system via current running system’s boot loader, and finally start installation while I’m in the live-system. Now I only have a Windows 7 LiveCD and Ubuntu (HowTos)