Users Guide

112 Installing Managed System Software on Windows Operating Systems
An installation cannot be rolled back once it has finished; transacted
installation is only intended as a safety net that protects the system during
an installation session. If you want to remove an installed application, for
instance, you should simply uninstall that application.
NOTE: Driver installation and removal is not executed as part of the installation
transaction and therefore cannot be rolled back if a fatal error occurs during
execution.
NOTE: Installations, uninstallations, and upgrades that you cancel during installer
cleanup, or after the installation transaction is completed, will not be rolled back.
Failed Updates
MSI patches and updates provided by vendors must be applied to the original
vendor MSI packages provided. If you intentionally or accidentally repackage
an MSI package, or make changes to it directly, patches and updates might
fail. MSI packages must not be repackaged; doing so changes the feature
structure and GUIDs, which break any provided patches or updates. When it
is necessary to make any changes to a vendor-provided MSI package, a .mst
transform file should always be used to do so.
Windows Installer Logging
Windows includes a registry-activated logging service to help diagnose
Windows Installer issues. To enable this logging service during a silent install,
open the registry editor and create the following path and keys:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Window
s\Installer
Reg_SZ: Logging
Value: voicewarmup
The letters in the value field can be in any order. Each letter turns on a
different logging mode. Each letter's actual function is as follows for MSI
version 3.1:
v - Verbose output
o - Out-of-disk-space messages
i - Status messages
c - Initial UI parameters
e - All error messages
w - Non-fatal warnings