[Samba] Samba as PDC

[Hogo]

Hey,

  I try to configure my homeserver to a PDC with Samba. I think my smb.conf
looks right, because I got it from the internet.
[global]
    workgroup = SAMBA
    netbios name = server
    server string = Linux Samba Server %v

    security = user
    encrypt passwords = Yes
    domain logons = Yes

    guest account = nobody
    local master = Yes
    preferred master = Yes
    domain master = Yes
    os level = 65

    domain groups = samba,root
    domain admin group = root
    domain admin users = root
    logon home = \\%L\Profiles\%U
    logon path = \\%L\Profiles\%U
    logon drive = z:
    logon script = %U.log.bat

  [homes]
    comment = Heimatverzeichnis
    read only = No
    create mask = 0750
    browseable = No

  [Profiles]
    comment = Profiles (WIN9x+NT)
    path = /usr/local/samba/profiles/
    read only = No
    create mask = 0700
    directory mask = 0770
    browseable = YES

  [netlogon]
    comment = Netlogon Share (Read-Only)
    path = /usr/local/samba/netlogon
    browseable = YES

'root' and my unix-account are writen in the smbpasswd. Now I log on with
Windows2000 and try to join to the SAMBA-domain. But I always get the error
message:'The used account is a workstation account. Use your normal
useraccount or a local useraccount to get on the server'(translated from
german)

What does this error want to tell me? What did I wrong?

Thanks for any help