SeTcbPrivilege

can anyone explaint this? i used windows help but it
didn't clear anything up for me.
Event Type: Failure Audit
Event Source: Security
Event Category: Privilege Use
Event ID: 577
Date: 25-Apr-04
Time: 12:08:25
User: EMBRYA\rob hill
Computer: EMBRYA
Description:
Privileged Service Called:
Server: Security
Service: -
Primary User Name: rob hill
Primary Domain: EMBRYA
Primary Logon ID: (0x0,0xF4D4)
Client User Name: -
Client Domain: -
Client Logon ID: -
Privileges: SeTcbPrivilege

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

i was searching thru the articles to find anything about
this event that keeps re-occuring in my security log. i
only found one article in here about it and it was un-
resolved. it doesn't seem to be hindering my system at all
but it keeps showing up so i would like to know wut in the
world it is.