I found the site below and thought of your situation. Here is the message I received:
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"Network error occurred while attempting to read from the file:
C:\\WINDOWS/Installer/Messenger.msi
Please
close all other open programs, and then try again. It looks like
another program is preventing the installer from working. hr.0x80070643"
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If
it's the same message, and you haven't found a solution yet, then this
will do the trick. Although it's an older post, it works just fine for
the current 14.0.8117.416 Messenger update issue:
http://www.pcadvisor.co.uk/forums/index.cfm?action=showthread&threadid=346865&forumid=1Scroll about halfway down the page. Look for Microsoft Customer Support (Joan, Technical Support, Live Essentials):
Note:
For the Windows Installer Cleanup Utility, I downloaded from this link
(you'll want the latest version wherever you get it - 2.5.0.1):
http://www.softpedia.com/progDownload/Windows-Installer-CleanUp-Utility-Download-18442.html
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