You should execute the following to verify that the EPT - Supports Extended page tables (SLAT) is available.
c:> coreinfo -v
This flag will show only the virtualization features of your CPU.
For example, my output:
Coreinfo v3.2 - Dump information on system CPU and memory topology Copyright (C) 2008-2012 Mark Russinovich Sysinternals - www.sysinternals.com
Intel(R) Core(TM)2 Quad CPU Q9650 @ 3.00GHz
Intel64 Family 6 Model 23 Stepping 10, GenuineIntel
HYPERVISOR - Hypervisor is present VMX * Supports Intel hardware-assisted virtualization EPT - Supports Intel extended page tables (SLAT)
( asterisk means your CPU has it )
In this case, my machine does NOT support the ability to run the WP8 emulator because I do not have EPT (SLAT) capability. You generally need an Intel i series processor.