A. Yes. The latest versions of ESX 4 and vSphere require a 64-bit processor. You also need a processor that supports hardware-assisted virtualization (AMD-V or Intel-VT) if you want to run 64-bit virtual machines (VMs). You can run 32-bit VMs without hardware-assisted virtualization, but you still need a 64-bit processor.
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Check out hundreds more useful Q&As like this in John Savill's FAQ for Windows. Also, watch instructional videos made by John at ITTV.net.