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Jun 21, 2012 2:27 AM in response to Cthuardby Carolyn Samit,Hi..
I have change my mac recently. I made from my 24 to my new 27
Quit the App Store if it's open.
Launch iTunes.
From the iTunes menu bar top of your screen click Store > Authorize This Computer
Quit iTunes. Now try the App Store.
Still see the error 100 message, try here > Mac App Store: "An unknown error occurred (100)" when purchasing