Problem with installing Ubuntu 12.04 dual boot with Windows 7

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http://askubuntu.com – Ok, I´m new to Ubuntu, and have been trying it out using WUBI, but now I´ve decided to install it on a dual boot configuration alongside my already existing Windows 7 installation. So here´s my problem: I have 3 HDD's, Windows 7 being installed on sda, with sdb and sdc only for storage. So I go to the installation process, and click the first option there " Install Ubuntu alongside Windows 7". Then I proceed to the next screen where I´m supposed to allocate drive space for the Ubuntu installation. Problem is, it only gives me the option to select my sdc drive, which is one of my storage H (HowTos)