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Aug 20, 2012 10:01 PM in response to rissesby Bimmer 7 Series,Have a look here for the step by step to do a clean install...if you're running snow leopard
http://support.apple.com/kb/HT3910?viewlocale=en_US
If you're running Lion - restart your Macbook while holding down the command + r key and release when you see the apple logo - once you've booted to the disk utility menu - erase your drive then reinstall LIon.