Logon audit

Hello list,
i need some help with interpreting what i see. I have Logon Failure Audit turned on on several machines in my system (all Win XP pro), and i keep getting this:
"
Logon attempt by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon account: <username>
Source Workstation: <stationname>
Error Code: 0xC000006E

Type stated is Failure Audit, Event ID is 680.
"

Username and workstation vary from machine to machine.

Now my question is, what is that Event ID680? I am sure that no users are trying to logon to mentioned machines, and that there is no shared-folder accessing going on. I tried to find answers all over the web, but to no avail as of yet.
Is is a worm/virus of some sort? Or another win intricacy?

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