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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: [ActivePython] Upgrading fails
Date: Tue, 06 Aug 2013 19:42:00 -0400
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On 8/6/2013 6:12 PM, Gilles wrote:
> Hello,
>
> I already posted in their forum, but got no reply and figured some
> people here might have experienced this too.
>
> I'm currently running ActivePython 2.5.1.1 on my XP Pro host.
>
> After downloading and running the installer to 2.7.2.5, I get the
> following error message:
>
> "Windows Installer: The Windows Installer Service could not be
> accessed. This can occur if the Windows Installer is not correctly
> installed."
>
> Has someone seen this, and knows what to do?

No and no. I would search "Windows Installer Service could not be
accessed" (I just did and there are lots of relevant hits.)
Try the same for any Windows error message.
-- 
Terry Jan Reedy