Anonymous Logon?

As a "computer geek wannabe," I'm constantly trying to improve my hardware and software skills. Lately, I've focused on looking under the hood of WinXP. The Event Viewer intimidates me, but I know I must learn to understand its messages to ever expect to be a good troubleshooter. Under Security, I found an entry that reoccurs repeatedly in the logs, showing an Anonymous Logon. Using the microsoft link has told me that the logon type is 3, meaning that "a user or computer logged on to this computer from the network." Can anyone tell me more? Here's the event:

Event Type: Success Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 540
Date: 2/14/2006
Time: 5:28:13 PM
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: I removed the name, but it displays in the log
Description:
Successful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x15A18)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name:
Logon GUID: {00000000-0000-0000-0000-000000000000}

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

 

I think I found the answer. Doesn't seem to be anything to get alarmed about. Sorry for posting before a complete search.

http://www.dslreports.com/forum/remark,6550262~root=security,1~mode=flat