Something

# /etc/xen/windows
 kernel = "/usr/lib/xen/boot/hvmloader"
 builder='hvm'
 memory = 1024
 shadow_memory = 16
 name = "windows"
 vif = [ 'type=ioemu, mac=00:16:3e:00:00:01, bridge=xenbr2, vifname=windows' ]
 disk = [ 'phy:/dev/vm/windows,hda,w', 'file:/home/gustavo/win2003.iso,hdb:cdrom,r' ]
 on_poweroff = 'destroy'
 on_reboot   = 'restart'
 on_crash    = 'restart'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 boot="d"
 sdl=0
 vnc=1
 vcpus=1
 apic=1
 acpi=1