How can I install windows 7 over ubuntu?

Installing Windows over Ubuntu is pretty easy, as Windows takes up the whole disk by default.

First, boot to the CD (you may need to modify your boot order in BIOS to acheive this)
Now, choose your language
Click 'Startup Repair'
Go into Command Prompt
Type format c: (this is required because Windows does not understand Ubuntu's filesystem, so it needs to format it)
You should get a warning. Just press Y.
Wait for it to finish, then install Windows
Profit!

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