How to uninstall Lion OS and install Win7?

I have a MacAir with 64Gb.
to fully utilise the space, i will like uninstall Lion and install Win7 only.
can anyone advise how to do it with bootcamp? if not possible, w/o bootcamp?
thanks

Do you have 10.6 Client? Does it boot/run on the latest Mini?
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
From there you can reformat or erase the Disk

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