Users Guide

84 Installing Managed System Software on Microsoft
®
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 with Regedt32.exe and create the
following path and keys:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\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
a - Startup of actions
r - Action-specific records
m - Out-of-memory or fatal exit information
u - User requests
p - Terminal properties
+ - Append to existing file
! - Flush each line to the log
"*" - Wildcard, log all information except for the v option. To include the v option, specify "/l*v".