It looks like you did not burn the image correctly. I struggled with this as well until I read on the instructions that you must apply the 'dd' command to the whole disk not a partition. Once I did this the process worked great.
I used Linux and 'dd' not WinImage but the same concept should apply.
BTW you know the image is good when it boots up with an Android logo, but it takes a while to show up. When you first plug in the cord the screen is blank, if you are greeting the B&N screen when you connect the USB cable you are not booting off of your SD card.
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