Welcome to the forums!
We also need to know if both guests should be able to connect to the physical network or not. In general you can use each of the three offered network types (bridged, host-only or NAT) to connect both guests. As soon as they can ping each other you should be able to add the XP guest to the domain (assumed that the domain is hosted on the other virtual guest).
Of course, depending on which network type you choose you need to have a valid IP setup.
Start reading here: http://pubs.vmware.com/ws71_ace27/ws_user/ws_net.html
AWo
VCP 3 & 4
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