I had same issue with my brothers pc with having DSETUP.DLL file be eaten by antivirus software. He had Mcafee antivirus software which I found was the culprit. Where he is running win8, I had him uninstall Mcafee due to win8 having Windows Defender.
After uninstalling Mcafee, we were able to successfully copy the DSETUP.DLL.
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