Uninstalling Ubuntu off completely on a netbook

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http://askubuntu.com – I have had ubuntu on my netbook for a while now but i really need windows back on my netbook for one of my classes. I have no idea how to take it off. Every way i have seen so far that takes it off my netbook seems to lead me to another problem. My netbook cant read CD's because there is no CD drive.i just bought windows 7 but all it came with is a code. I really need help. i have ubuntu 12.04 on it i believe. (HowTos)