While attempting to install a 64bit OS in ESX Server you receive the following message
Host CPU is incompatible with the virtual machine’s requirements at CPUID level 0x80000001 register ‘edx’.
host bits: 0000:0000:0000:0000:0000:0000:0000:0000
required: xx1x:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
Mismatch detected for these features:
*Longmode; required when virtual machine is configured for a 64-bit OS.
Cause:
The Virtualization Technology (VT) Extensions have not been enabled in the server BIOS.
Solution:
To install and configure 64bit operating systems in ESX Server requires that Virtualization Technology (VT) Extensions be enabled in the server BIOS settings.
Change the setting on BIOS for Virtualization.