Trying to get ADE to recognize my NookColor, which I used for 3+ years with my Dell desktop.

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Per posts I just read, I tried to check the files on my NookColor, but keep getting a window that says "I am not authorized to access this device" and that I must use the "security tab." WHAT security tab?? I just started using Win7 on this new HP sys unit; is there a security tab hidden somewhere that I can't figure out? HELP! I just downloaded a book from my local library and have only 21 days to read it. Need to get my NookColor back online fast!