[ubuntu] Adding Vista to Ubuntu

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http://ubuntuforums.org – I just purchased a used Dell Latitude D620 computer with Ubuntu 12.04 already installed. There are no partitions. It just installs Ubuntu. I would like to add a partition so that I can dual boot Windows Vista. Is there any way to do this? I am already familiar with how to set Ubuntu up for dual booting when installing on a Windows machine, but I have never made a partition from Ubuntu so that it can dual boot Windows. Can anyone give me any step by step instructions on how to do this? (Hardware)