Security error, EventID 529

Using SBS2003 SP1 and XP Pro.

I've been getting over 100 errors a day regarding an EventID 529:

Logon Failure:
Reason: Unknown user name or bad password
User Name: jsantos
Domain:
Logon Type: 3
Logon Process: Advapi
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Workstation Name: SBSSERVER
Caller User Name: SBSSERVER$
Caller Domain: WORKPLACE
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 6936
Transited Services: -
Source Network Address: -
Source Port: -


I can't figure out how to stop this. The username it's referring to is mine,
but I can login to any workstation just fine.

Any ideas?

Thanks.
Jason


.

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