Thanks. The error message did not refer to the difference between 32-bit and 64-bit, only to the supposed absence of Python 2.7. And Idle says it's using Python 2.7.2 64 bit AMD64 on Win 32, which confused me.    However, I see that the suggested web page contains the following four options, each of which apparently offers a NumPy-like Windows installation package for 64-bit windows machines:   Bottleneck-0.5.0.win-amd64-py2.7.exe   numpy-MKL-1.6.1.win-amd64-py2.7.exe  [*-see comment below]   numpy-unoptimized-1.6.1.win-amd64-py2.7.exe   numscons-012.0.win-amd64-py2.7.exe [*-coment] This item is described as "not compatible with the official SciPy distributions." Any comments on which ones I should try first? The Helmbolds 2645 E Southern Ave A241 Tempe AZ 85282 Email: helmrp@yahoo.com VOX: 480-831-3611 CELL: 602-568-6948 (but not often turned on)

________________________________ From: "numpy-discussion-request@scipy.org" <numpy-discussion-request@scipy.org> To: numpy-discussion@scipy.org Sent: Monday, September 26, 2011 10:00 AM Subject: NumPy-Discussion Digest, Vol 60, Issue 55

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Today's Topics:

  1. Re: Trouble installing numpy (Charles R Harris)   2. Re: Trouble installing numpy (Olivier Delalleau)

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Message: 1 Date: Mon, 26 Sep 2011 10:14:16 -0600 From: Charles R Harris <charlesr.harris@gmail.com> Subject: Re: [Numpy-discussion] Trouble installing numpy To: Discussion of Numerical Python <numpy-discussion@scipy.org> Message-ID:     <CAB6mnx+rC01d7mAtdEgvGxT=SEh+vRLo5P-HSvGvG16XreN2Hw@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1"

On Mon, Sep 26, 2011 at 9:43 AM, The Helmbolds <helmrp@yahoo.com> wrote:

...

Using Source Forge download of NumPy installer package:   numpy-1.6.1-win32-superpack-python 2.7.exe.

Installation Wizard starts, but then installation fails with error message:   Python version 2.7 required, which was not found in the registry

Idle says it's using:   Python 2.7.2 64 bit AMD64 on Win 32

So what's holding up the installation, and what do I need to do to install numpy?

Your Python is 64 bits, the numpy package is 32 bits and needs 32 bit Python. If you need free 64 bit numpy on windows your best bet is probably here <http://www.lfd.uci.edu/%7Egohlke/pythonlibs/>.

Chuck