I've installed Windows7 64bit (Enterprise) on my AMD Athlon 64 System. After all automatical Updates, I've installed the VirtualPC 6.1.7600. (64bit) I created a new Virtual machine: Windows Server 2008, an own VHD, 1 GB RAM... When I try to install "Windows Server 2008 R2 (64bit)", the setup interrupts with this errormessage: "Attemping to load a 64-bit application, however this CPU is not compatible with 64-bit mode" Is it not possible to run a 64bit-OS with VirtualPC on Windows7?