Adding a computer to a domain

Question

Hi everybody!

I'm quite new in managing Active Directory.. So, i have a Microsoft Server 2008 on my WMware virtual machine. Also
i have a domain "confire.com" and a domain controller on it. The problem is that i can't  join this domain from my real machine 
which has a Windows 7 operating system.
The network and the ip i suppose are correctly configured because i can ping both virtual machine and real machine from each other.


I have a trouble while joining a real computer to a domain (confire.com):

The request was for the SRV record _ldap._tcp.dc._msdcs.confire.com

The following domain controllers were identified by the query:
win2008r2test.confire.com

However, any domain controller could not be contacted.

Probable reasons of this error are:

Host (A) records that map the name of the domain controller to its IP addresses are missing or contain incorrect addresses.

Domain controllers registered in DNS are not connected to the network or are not running.



And i'm always getting this error.
Can anybody help me?
Thanks a lot