Python 3.5.0: python.exe is not a valid Windows 32 application

[Laura Creighton]

In a message of Sun, 08 Nov 2015 13:34:22 +0100, Tomáš Beňák writes:
>Hi,
>
>I have downloaded the Python 3.5.0 installer for x86 (
>https://www.python.org/ftp/python/3.5.0/python-3.5.0.exe) and have
>installed it on my Windows XP SP3. The installer run to a successful end,
>but when I try to run python.exe, it ends with an error saying that
>python.exe is not a valid Windows 32 application.
>Is this a bug? Is my Windows XP a problem? Should I try another release of
>Python? Could you provide me with the link?
>Thank you.
>
>Best regards
>Tomáš Beňák

This is an XP problem.  XP is not supported for 3.5 and later.
The latest you can run is 3.4.3
https://www.python.org/downloads/release/python-343/

Laura