Problem after trying to install 64bit Ubuntu using Wubi from mounted iso file

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http://askubuntu.com – I tried installing Ubuntu x64. I mounted the .iso file using daemon tools, and copied its contents on my USB. I already configured BIOS to boot from USB. I found wubi.exe in that mounted .iso file. I ran it and it installed Ubuntu, then it said, I must reboot. I selected reboot now options. When it boots, it says no wubildr, then it says completing the ubuntu installation (or something like that) and some stuff. if I press ESC It goes to black screen, and nothing happens. I have : HP pavilion G7 1303 CPU: 64 bit CPU GRAPHIC CARD: AMD Radeon HD 7450M, 1 GB Memory (HowTos)