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Check to make sure your credit card info linked to your Nook is up to date. Even though they are free they still read back against that card.
I couldn't run any apps on my new Nook Color (I was getting the "Unable to Download..." error too) until I manually installed a software update. I know this thread is old but it's one of the references that turned up in web searches as I tried to figure out the problem. For whatever it's worth, I wrote more about this: Nook Color: Unable to Download Apps.