Issue: Automatic Updates (AU) service is disabled by group policy, attempting to start the service results in the following error on a Windows XP SP2 machine:
Could not start the Automatic Updates service on Local Computer. Error 0x80004015: The class is configuired to run as a security id different from the caller
From a command prompt, re-register the Automatic Updates dll by running:
regsvr32 /u wuaueng.dll
Change the Automatic Updates service startup from disabled to manual. The AU service should now start.