Let me make sure I understand the problem. You are able to buy the books using your Kindle but not on your PC?
Is the address listed in your Kindle Account one in the US?
If so, and this is a massive guess here, then it could be that your Kindle is treated as having access to the US market. It is possible that Amazon is detecting a non-US based IP address on your PC and that is why you are blocked using your PC.
Pure guess.
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