Windows guest operating systems can be installed as guests on a host computer that is running any of the following combinations of domain 0 and hypervisor architecture.
Windows Vista (32-bit) Guest Operating System
32-bit hypervisor / 32-bit domain 0
32-bit PAE hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 64-bit domain 0
Windows Vista (64-bit) Guest Operating System
64-bit hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 64-bit domain 0
Windows Server 2003 R2 (32-bit) Guest Operating System
32-bit hypervisor / 32-bit domain 0
32-bit PAE hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 64-bit domain 0
Windows Server 2003 (64-bit) Guest Operating System
64-bit hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 64-bit domain 0
Windows 2000 Server Guest Operating System
32-bit hypervisor / 32-bit domain 0
32-bit PAE hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 32-bit PAE domain 0
64-bit hypervisor / 64-bit domain 0