Do you have the original Mac OS X Install DVD? Just pop that in, restart the MacBook Air, just after you hear the "dong" sound on startup with the white screen, immediately press an hold down your Control key (I think it is) an you will get a select menu of what you want to boot into like on Windows, select your Mac OS X DVD an everything else is pretty much self explainatory from there to have everything back to factory default as if you just bought the MacBook.
(: hope this helps mate.
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