child domain installation using vmware

Hi
I have installed vmware on XP professional and have installed vmware server version on 1.5ghz Ram.

I installed windows 2003 on one vmware session and suceesfully created parent domain using dcpromo.
However when i created another session in vmaware using windows 2003 to create a child domain, dcpromo switch is no functioning as it says the child domain (XXXX) already exists.
My DNS for parent domain is configured properly in second session for child domain I have already pointed the network config to the dns of parent domain..

Pls help as i am unable to install child domains in subsequent session of vmware.