Problems connecting to zentyal 3 Samba PDC from windows 7 / windows xp

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http://serverfault.com – I'm new to zentyal, and I wanted to test it. I have an existing network, with a cisco router, no firewall, DHCP on. I've setup up the zentyal 3 server with default settings, made some users etc. I get to the point of joining a domain and when i type the domain : zentyal-domain.lan, i get an error that the domain doesn't exist. Tried to connect to zentyal-domain, which is the computer name, login appears but after a while I get an error that the domain doesn't exist or bad credentials. Can anyone help me with the setup ? Sorry for any mistakes, English is my second language :) Thank you (HowTos)