Can't install Ubuntu 12.10 alongside Windows 7 using a usb pen drive

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http://askubuntu.com – I downloaded the desktop version of Ubuntu 12.10 32-bit and installed it in my computer with the "Universal Usb Installer". I restarted the computer and the computer automaticaly ran the Ubuntu Instalation. I set it to install alongside Windows 7. I was planning to leave 80GB for Windows and 170GB for Ubuntu. After I set everything, I cliked to install and then came my problem. It wouldn't install. It was taking an awful lot of time so I saw there was an error message (I don't know what exactly) appearing on the instalation screen. I had to abruptly stop the whole operation because there wasn' (HowTos)