You're having a problem with a Symantec product on the system. This log file looks to be generated by Symantec Live Update, which is the update program for Symantec apps.
This error is saying how it can't get the rights that Live Update is running under to determine something on a Windows Service.
So, here's my thought. LiveUpdate is mangled and is trying to connect to the Internet to get the list of updates for the Symantec products on this system. Maybe it needs to stop a Service to perform the update, and this is failing, so it can't perform the update. It then logs this in the file.
So, I would check the status of any Symantec programs on this system, make sure they are all up to date. Also, try running LiveUpdate manually (instead of automatically) and see what it tells you.
Your Event Viewer logs (Application and/or System) might also have information on this.