[Samba] Facing Problem for Window XP Client On Samba PDC

[Junaid]

Hi, 
     i want to make Samba PDC, i have created domain and now when i give name of domain in WindowXP it requires the password, i do it by user name=root & its password. But it gives error. "Unknown User or bad password".
   
   User name and password both are right. i have also done setting of Window XP
   
  requiresignorseal=0
   
  can any one help me, where is actually problem and how 2 solve it. 
   
  thankx 
   
  My smb.conf is
   
  # Samba config file created using SWAT
# from 0.0.0.0 (0.0.0.0)
# Date: 2006/12/02 12:49:11
  # Global parameters
[global]
 ldap ssl = no
 admin users = root
 obey pam restrictions = Yes
 write list = root, junaid
 client signing = Yes
 delete user from group script = /usr/sbin/deluser %u %g
 passwd program = /bin/passwd %u
 template primary group = samba
 netbios name = THRILLER.GIFT
 logon script = /var/lib/samba/netlogon
 username = root, junaid,
 workgroup = THRILLERDOMAIN
 os level = 64
 server signing = Yes
 security = DOMAIN
 add machine script = /usr/sbin/adduser -n -g machines -c Machine -d /var/lib/nobody -s /bin/false %u
 delete user script = /usr/sbin/userdel
 log file = /etc/samba/var/log.%m
 add group script = /usr/sbin/groupadd
 delete group script = /usr/sbin/groupdel
 add user to group script = /usr/sbin/adduser %u %g
 logon drive = H:
 auth methods = sam, trustdomain, winbind
 username map = /etc/samba/user.map
 domain master = Yes
 encrypt passwords = yes
 winbind use default domain = Yes
 passdb backend = smbpasswd, tdbsam
 wins support = Yes
 winbind enum users = No
 default service = global
 winbind enum groups = No
 add user script = /usr/sbin/adduser
 valid users = @root, samba
 set primary group script = /usr/sbin/usermod -g '%g' '%u'
 preferred master = Yes
 domain logons = Yes
  [netlogon]
        path = /var/lib/samba/netlogon
        command = The domain logon service.
        guest ok = yes
        public = no
        writable = no
        share modes = no
  
[profiles]
 path = /var/lib/samba/profiles
 read only = No
 create mask = 0600
 directory mask = 0700

   
   

 
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