How to overwrite Ubuntu with Windows 7?

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http://askubuntu.com – So I have a Windows DVD and it works. But when it gets to the part when it says "Upgrade" or "Custom" I click on custom and at the bottom it says cannot install over it because Windows 7 can only be installed on an NTFS drive? I know that Ubuntu formatted my partitions into one big on that's an ext4. What can I do? I know that I can maybe create a 30-50 GB partition that's an ntfs then when I go into windows I can format the Ubuntu one and combine them but I don't know how to make a partition much less make a big partition in the "GParted" program? So any ideas would be very helpful. I know h (HowTos)