Event ID - 16

Event Id16
SourceAutomatic Updates
Description The description for Event ID (16) in Source (Automatic Updates) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details.
Event InformationCAUSE :
This problem occurs because the RegisterEventSource function cannot find the Automatic Updates event source.

Before an Automatic Updates event is logged for the first time, the location of the source file for the Automatic Updates event is noted in the system log under the Eventlog subkey. Immediately thereafter, the RegisterEventSource function obtains a handle to write events. If the location of the source file has not yet been flushed to the registry when the RegisterEventSource function obtains a handle to write events, the RegisterEventSource function logs the event in the application log instead of in the source file. However, if an Automatic Updates log entry is logged in the application log, Event Viewer cannot display the message for the event. Instead, Event Viewer displays the message that is described in the "Symptoms" section in this article. 
STATUS :
Microsoft has confirmed that this is a problem in the Microsoft products like Win2003 Standerd/Enterprise editions.

Following newsgroup information may help:

Change the logon account of windows update to domain user account who is also a member of  local admin group.
You can do it as follows:
1. Right click my computer- select manage.
2. select services and applications and right click on automatic update service and open properties.
3. Click on logon tab. There change the local system account by enabling This account and enter domain user account and password.
Reference Links Automatic Updates logs Event ID 16 in the application log

ISA Server logs Event ID 16 when you turn on Automatic Updates in Small Business Server 2000

Automatic Updates Cannot Download Updates and Event ID 16 Is Logged

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