Need help with bootcamp!!

so have 2011 imac , i've installed bootcamp before. when tried time says cannot partition disk because files cannot moved. defragged hard drive no luck. ideas on why won't work , how can fix it???

 

as error dialog window suggested, need backup data, reinstall mac os x onto freshly formatted hdd , run boot camp assistant again.

faster cloning mac os x partition onto external hdd, booting external hdd, formatting internal hdd , cloning contents external hdd internal hdd.

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maybe have @ advanced search find dozens of similar threads, multiple solutions have been posted ad nauseum:

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