I installed XenServer using Parallels Desktop 6 using XenServer-5.6.0-install-cd.iso. I selected OS type Other in virtual machine configuration. I didn't add any extra packages. I don't know anything about XenServer so I don't know what to do with it. It boots to a configuration screen (attached).
VM configuration:
1 GB RAM, 1 CPU, 32 MB VRAM, 64 GB HD, Shared Network.