IPSEC Service Error

I have found that my IPSEC Services is not starting and shows an error code
1747 (The authentication service is unknown) when I bring up the service
properties and try to manually start the service. I'm looking for a solution
that windows help and the hyperlink have not been able to supply me. This is
the error as logged:
Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7023
Date: 11/22/2005
Time: 1:24:51 PM
User: N/A
Computer: DJ-HOME
Description:
The IPSEC Services service terminated with the following error:
The authentication service is unknown.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

The path to the executable (C:\WINDOWS\system32\lsass.exe) is valid and the
..exe file is present. The service description reads "Manages IP security
policy and starts the ISAKMP/Oakley (IKE) and the IP security driver." Under
the "log on" tab I find the box checked to show "Log on as: Local System
account". This error shows that it started on Nov 5 and also has instances
(on that and susequent dates) showing:
Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7023
Date: 11/5/2005
Time: 1:47:51 PM
User: N/A
Computer: DJ-HOME
Description:
The Application Management service terminated with the following error:
The specified module could not be found.




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