I have Nook for PC set up on my Windows 10 PC. It downloaded fine even last month. When I saw this thread, I tried to download a Nook book and - yup, I'm seeing the same 2157 message! So this is very new. I know my credit card is good - checked that.
I had Nook Study before. I found it a bit of a pain at times, but I may try it again. Or, I may try uninstalling Nook for PC and re-installing, and see if that fixes the problem.
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