I am running XP Pro (64-bit) with SP2 as my host. I am trying to run Server 2008 (64-bit) as a guest OS. When I try to start the VM, I receive the message "VT-x/AMD-V hardware acceleration has been enabled, but is not operational." It goes on to suggest checking the BIOS settings. I have! I have enabled virtualization support as follows:
Intel Virtualization Technology
Intel VT for Direct I/O
Intel Trusted Execution Technology
This Dell Optiplex 960 has full support for virtualization, including BIOS, OS, and motherboard. In fact, I am successfully using the same VM on another identical machine from a hardware standpoint. There has to be a software setting somewhere that is keeping VT-x from being operational. I created a new VM on this PC using the same VDI file as on the one where it works by using an existing virtual hard disk. The usual suggestions to check your BIOS, hardware support, and so forth have already been done. If anyone has any other suggestions, I'd really appreciate it!