Error installing Security Bulletin MS06-003

I was having a difficult time getting the security update that addresses the vulnerability referenced in Microsoft security bulletin MS06-003 (Vulnerability in TNEF Decoding in Microsoft Outlook and Microsoft Exchange Could Allow Remote Code Execution (902412)) to install. The event viewer showed the following:
Event Type: Error
Event Source: MsiInstaller
Event Category: None
Event ID: 1024
Date: 1/10/2006
Time: 2:00:52 PM
User: DOMAIN\USERNAME
Computer: COMPNAME
Description:
Product: Microsoft Office Small Business Edition 2003 - Update 'Security Update for Outlook 2003 (KB892843): OLKINTLff' could not be installed. Error code 1603. Windows Installer can create logs to help troubleshoot issues with installing software packages. Use the following link for instructions on turning on logging support:
http://go.microsoft.com/fwlink/?LinkId=23127

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7b 39 31 43 41 30 34 30 {91CA040
0008: 39 2d 36 30 30 30 2d 31 9-6000-1
0010: 31 44 33 2d 38 43 46 45 1D3-8CFE
0018: 2d 30 31 35 30 30 34 38 -0150048
0020: 33 38 33 43 39 7d 20 7b 383C9} {
0028: 38 31 43 46 46 37 39 45 81CFF79E
0030: 2d 30 34 45 36 2d 34 31 -04E6-41
0038: 42 43 2d 42 34 46 41 2d BC-B4FA-
0040: 44 32 46 46 34 44 45 35 D2FF4DE5
0048: 38 41 31 35 7d 20 31 36 8A15} 16
0050: 30 33 03

I did some troubleshooting. Ultimately, the problem wound up being that the "Office Source Engine" service had been disabled. Re-enabling the service allowed me to apply the patch successfully.

Error 1603, referenced in the event log message, is "Fatal error during installation."

Helpful.