Install Windows7 side by side with ubuntu 12.04

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http://askubuntu.com – I had a Windows OS on my machine. One time, when I tried installing Kubuntu 12.04, I messed up the whole computer and it wouldn't boot up anymore. So, I installed Ubuntu 12.04 from a USB drive and it worked. Now, I need Windows for my school work. So, I wanted to ask if I can install Windows 7 without deleting Ubuntu 12.04 and how do I install it? (HowTos)