vista in workgroup try to authenticate in domain dc


hi

i have a sbs 2003 server

i got computers that connected to the domain

and a workgroup

the workgroup used to be XP
now i upgraded it to VISTA ULTIMATE
after the upgrade one computer keep sending authentication request to
the DC
and give a lot of 529 error id in event viewer

------------------------------
Logon Failure:
Reason:
Unknown user name or bad password
User Name:
COMPUTERA
Domain:
COMPUTERA-PC
Logon Type:
3
Logon Process:
NtLmSsp
Authentication Package:
NTLM
Workstation Name:
COMPUTERA-PC

Caller User Name:
-
Caller Domain:
-
Caller Logon ID:
-
Caller Process ID:
-
Transited Services:
-
Source Network Address:
192.168.0.162
Source Port:
0

-------------------------------------


what can cause this ?
the workgroup recieve DHCP services from the server

there is no folder sharing with the server
no scheduled tasks
no saved netwrok passwords on vista
nothing that should cause this

the vista pc is formated and got anti virus on it
so it's not a virus

thanx


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