Probleme de configuration de samba

Bonjour,

j'ai installé ubuntu sur la machine virtuelle VirtualBox sur Vista.
J'ai installé ensuite un serveur samba, mais celui ci ne fonctionne pas :(
j'ai utilisé le meme nom d'utilsateur et mot de passe que windows mais en vain.
alors svp quelqu'un peut m'aider??? merci d'avance
voici mon fichier de configuration smb.conf
(NB: j'ai utilisé ce meme fichier pour windows xp et ça na pas marché aussi)


[global]
workgroup = WORKGROUP
server string = %h
wins support = yes

dns proxy = no
name resolve order = lmhosts host wins bcast

interfaces = eth0
#### Debugging/Accounting ####

log file = /var/log/samba/log.%m
max log size = 1000
syslog = 0
panic action = /usr/share/samba/panic-action %d


####### Authentication #######
security = user
encrypt passwords = true
passdb backend = tdbsam
obey pam restrictions = yes
unix password sync = yes

passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
pam password change = yes

map to guest = bad user

########## Domains ###########

domain logons = yes
logon path = \\%N\%U\profile
logon script = logon.bat
#======================= Share Definitions =======================
[homes]
comment = Home Directories
path = /home/freebo
root preexec = /usr/local/sbin/mkhomedir.sh freebo
browseable = No
writeable= yes
read only = yes
create mask = 0700
directory mask = 0700
valid users = freebo
hosts allow = 10.0.2. 192.168.1.

[netlogon]
comment = Network Logon Service
path = /home/samba/netlogon
valid users= %U
read only = yes
share modes = no

[%U]

Comment = répertoire de %U
Path=/home/samba/users/%U
Valid users=%U
public=yes
writable=yes
printable=no
browsable = yes

[partage]
comment = Ressource partagée
path=/home/samba/commun
browseable = yes
guest ok = yes
writable = yes
create mask = 0777
directory mask = 0777
Valid users=%U

[profiles]
comment = Users profiles
path = /home/samba/users
guest ok = no
browseable = no
create mask = 0600
directory mask = 0700

[print$]
comment = Printer Drivers
path = /var/lib/samba/printers
browseable = yes
read only = yes
guest ok = no
write list = root, @WORKGROUP