Failing to install manually kb files (.msu), I found this trick on the web.
Do you think it can install msu files in this way ?
"expand -f:* "C:\file.msu" %TEMP%"
"start /w /IP /m:%TEMP%\file.cab"
I found also this command on Microsoft site
http://support.microsoft.com/kb/934307/ : "pkgmgr.exe /n:%TEMP%\file.xml"