IPSEC service will not start

[ERWAN]

Hello friends,

Whenever I am trying to run IPSEC service its not running its set to automatic. When I am try to restart the service I am getting popup message saying that "Error 1747 The authentiction service is unknown".
Event Viewer says, "The IPSEC services terminated with the following error: The authentiction service is unknown Event ID 7023".

Command prompt,
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Mark>sc query IPSEC
SERVICE_NAME: IPSEC
TYPE : 1 KERNEL_DRIVER
STATE : 4 RUNNING
(STOPPABLE,NOT_PAUSABLE,IGNORES_SHUTDOWN)
WIN32_EXIT_CODE : 0 (0x0)
SERVICE_EXIT_CODE : 0 (0x0)
CHECKPOINT : 0x0
WAIT_HINT : 0x0

Below is system configuration of my machine please check.
Using windows xp sp 2
2 gig ram
E6600 chip
8800 gtx
creative xfi champion
dvico fusion 4 pci express
GA-965P-DQ6 (rev. 1.0)

[Stuartl]

IPSEC Services
Default Description: Manages IP security policy and starts the ISAKMP/Oakley (IKE) and the IP security driver.

Additional Information:
May be required on some domains or VPN connections. After the installation of Service Pack 2, some processes and applications may take advantage of this service.

Defaults Startup Type:
Default XP Home: Automatic
Default XP MCE 2005: Automatic
Default XP Pro: Automatic
Default XP Pro x64: Automatic
Default XP Tablet PC 2005: Automatic

Other Settings: Safe Setting: Automatic

Service Names: Service Name (registry): PolicyAgent

Display Name: IPSEC Services

Default Path and Command Line Options: C:\WINDOWS\system32\lsass.exe

Log On As:
Account: Local System Account

Dependencies: What service IPSEC Services needs to function properly:
a.. IPSEC Driver
b.. Remote Procedure Call (RPC)
c.. TCP/IP Protocol Driver
a.. IPSEC Driver
What other service require IPSEC Services to function properly:

a.. None
Default Registry Entries:
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent]
"Type"=dword:00000020
"Start"=dword:00000002
"ErrorControl"=dword:00000001
"DisplayName"="IPSEC Services"
"DependOnService"=hex(7):52,00,50,00,43,00,53,00,53,00,00,00,54,00,63,00,70,00,\
69,00,70,00,00,00,49,00,50,00,53,00,65,00,63,00,00,00,00,00
"DependOnGroup"=hex(7):00,00
"ObjectName"="LocalSystem"
"Description"="Provides end-to-end security between clients and servers on TCP/IP networks. If this service is stopped, TCP/IP security between clients and servers on the network will be impaired. If this service is
disabled, any services that explicitly depend on it will fail to start."