When restoring my iphone 4 i get a error message -50

Hi can anyone help me im stuck. My iphone 4 was synced with a mac. my mac died, so I got a windows laptop. I downloaded I tunes and when restoring my iphone it comes up with a error message -50.
can anyone tell me how to fix this problem?

See this... http://support.apple.com/kb/TS3694

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