[ubuntu] Run Vista under ubuntu with VirtualBox from hard disk

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http://ubuntuforums.org – Running vista with an existing vista .iso image file or dvd is possible and explained clearly on many internet sites. But I don't have a vista .iso image file. I have a dual boot of vista and ubuntu on my hard disk. I can run both separately. I want to run vista without waiting to shut down ubuntu and starting up vista. Can't I run vista with virtualbox at the same time in ubuntu? (Hardware)