Package Manager Problem

I just wanted to draw a TikZ picture. This requires pgf, tikz and some 
other packages. I have access to the administrators account and wanted 
to make these packages available to all users.

I startedt the MiKTex 2.9 Package Manager (Admin) and selected the first 
required package "pgf". When I started "install". The Pakcage Manager 
did this:

   starting package maintenance...
   installation directory: "C:\Program Files\MiKTeX 2.9"
   package repository: 
http://mirrors.dotsrc.org/ctan/systems/win32/miktex/tm/packages/
   lightweight database digest: 8bf1629e89c2ebe3259d18f353cdfe44
   going to download 5606409 bytes
   going to install 412 file(s) (1 package(s))
   downloading 
http://mirrors.dotsrc.org/ctan/systems/win32/miktex/tm/packages/pgf.tar.lzma...
   5606409 bytes, 625.22 KB/Sec
   extracting files from pgf.tar.lzma...

After the download I get the problem report:

   MiKTeX Problem Report

   Message: Windows API error 87: The parameter is incorrect.

   Data: 
C:\ProgramData\MiKTeX\2.9\miktex/data/le\be48a8a88e3570f31e8be8fd4a43a2fd.fndb
   Source: Libraries\MiKTeX\Core\win\winMemoryMappedFile.cpp
   Line: 120
   MiKTeX: 2.9
   OS: Microsoft Windows 7 Business Edition, 64-bit Service Pack 1 
(build 7601)
   Invokers: explorer
   SystemAdmin: yes
   PowerUser: no
   Root0: C:\Users\Admin\AppData\Roaming\MiKTeX\2.9
   Root1: C:\Users\Admin\AppData\Local\MiKTeX\2.9
   Root2: C:\ProgramData\MiKTeX\2.9
   Root3: C:\Program Files\MiKTeX 2.9
   UserInstall: C:\Users\Admin\AppData\Roaming\MiKTeX\2.9
   UserConfig: C:\Users\Admin\AppData\Roaming\MiKTeX\2.9
   UserData: C:\Users\Admin\AppData\Local\MiKTeX\2.9
   CommonInstall: C:\Program Files\MiKTeX 2.9
   CommonConfig: C:\ProgramData\MiKTeX\2.9
   CommonData: C:\ProgramData\MiKTeX\2.9

I gave up with this try and allowed per-user installation of the 
packages since I wanted to continue work.

But what's wrong with the Package Manager?
How can I fix this problem?

/Andy


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