Create a new string value called “Logging” and set it to a combination of the letters below to enable the logging options. A value of “voicewarmup” will enable all the logging options.

System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer]
Value Name: Logging
Data Type: REG_SZ (String Value)

Letter Option:
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 Start up 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

The next time Windows Installer is used a log will be created.

Note: Windows Installer will store the logs in the TEMP directory. The filename is random, but begins with the letters “Msi” and end with a .log extension.