Flutter Installation error on Windows

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I have a hit a problem very early on in the official tutorial for using Flutter. Specifcally, when I run Flutter Doctor I get this error message:

X Downloaded executables cannot execute on host.
See https://github.com/flutter/flutter/issues/6207 for more information

When I follow that link there is nothing there that looks relevant. (It is mostly about LINUX problems)

Can anyone advise me what I should do?

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