Fedora installation problem on virtualbox

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http://unix.stackexchange.com – I try to install Fedora as a guest operating system on VirtualBox in Windows7 64-bit.I download Fedora-17-x86_64-Live-Desktop.iso first and when I begin to install everything fine until I see "Congratulations,you succesfully install fedora" page.When I reboot fedora virtualbox stopped.I search on google but could not find anything to solve my problem. (HowTos)