[ubuntu] How to install Ubuntu 12.10 and Windows 8 together

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http://ubuntuforums.org – Hi everyone! I've got problems with the installation! At moment I have a new laptop, and windows 8 already installed. I'd like to install Ubuntu but I want Windows as well because it is the original version. The problem is that I have only one partition that is the root for windows8, Can I get some space from the HDD ie 100GB where to install Ubuntu? Do you know some software that I could use to do this? It seems that on Italian Ubuntu website nobody knows how to tackle with this problem, I think it is very important, because a lots of people that buy a new computer with windows won't (Hardware)