I am new to linux. I want help related to my dell laptop on which I want to install Ubuntu 12.04 LTS within Windows 7. The problem happens when I select the option in installer to *Install ubuntu 12.04 within win7* , after selecting this option the installer closes and command prompt massage appears showing "Attempting to terminating everything" then my cd drive is opens and the installation is closes. I have 500 gb hardisk.