On-the-fly installation of missing packages

In the beginning of the installation of the latest Miktex 
(basic-miktex-2.9.5105.exe)
on a Windows Vista (32-bit) platform I get the following choices:

Install MiKTeX for:
      x Anyone who uses this computer (all users)
      o Only for Virgil

  and I keep the default (Anyone who ...)

And then later (just before I actually start the installation) I get the following
information (Review of my settings):

*****************

  Install basic packages to
    C:\Program Files\MiKTeX 2.9

  Install MiKTeX for all users

  Preferred paper size is A4

  Packages will be installed after confirmation by user

******************
I then use the Update (Adim) to update my installation and
synchronize my repository in the Package Manager (Adim).

When I check the installation with the file test.tex,

latex test

A popup window appears that is titled -- Package Installation with
information on a file that is missing (which is as expected for test.tex).

There are two editable entries, the top one is where the missing package
will be installed from. I am using mirror.ox.ac.uk, which is working properly
it seems.

In the second editable entry I am given two choices for "The package will be 
installed for:"

   1) Anyone who uses this computer (all users)
   2) Virgil

If I choose 1) then I ALWAYS get an error of the following type:
...
   ...
===================================================================
   latex: Unknown MiKTeX exception.
===================================================================

   ! LaTeX Error: File `beamer.cls' not found.

   Type X to quit or <RETURN> to proceed,
   or enter new name. (Default extension: cls)

   Enter file name:
   ...
   ...

However, if I choose 2) then it installs the missing package (beamer.cls)
and continues with the compilation.

Note, I have also tried other mirrors and the same problem occurs,
so it seems safe to assume this is not a mirror problem. My security settings
for the folder MiKTeX 2.9 are as follows:

Allow  Administrators (VIRGIL-DESKTOP\Administrators)  Full control  <not 
inherited)  This folder, subfolders and all files
Allow  Users (VIRGIL-DESKTOP\Users                     Full control  <not 
inherited)  This folder, subfolders and all files
Allow  TrustedInstaller                                Full control  <not 
inherited)  This folder, subfolders and all files
Allow  CREATOR OWNER                                   Full control  <not 
inherited)  Subfolders and files only
Allow  SYSTEM                                          Full control  <not 
inherited)  This folder, subfolders and all files

Interestingly, using the same 32-bit version miktex with the same options
and security settings on the folder MiKTeX 2.9; but on a Windows 8.1 platform, 
the first
choice works ok!

And finally to my question -- Why does choice 1) fail on Windows Vista?
I will be glad to supply any further information that may be needed to resolve 
this problem.



------------------------------------------------------------------------------
Don't Limit Your Business. Reach for the Cloud.
GigeNET's Cloud Solutions provide you with the tools and support that
you need to offload your IT needs and focus on growing your business.
Configured For All Businesses. Start Your Cloud Today.
https://www.gigenetcloud.com/
_______________________________________________
Q: How can I leave the mailing list?
A: See http://docs.miktex.org/faq/support.html#leavingml