The Hardware-assisted virtualization (HAV) detection tool checks if the computer processor supports HAV and if this setting is enabled.
Microsoft Windows Virtual PC and Microsoft Windows XP Mode within Windows 7 requires processors capable of hardware-assisted virtualization with AMD-V, Intel VT or VIA VT turned on in the BIOS.
Microsoft's HAV detection tool helps you check if the computer processor supports hardware virtualization. And the tool also checks to see if this feature is enabled on the processor.
You can download the Microsoft Hardware-Assisted Virtualization Detection Tool, here.
You can also try these tools:
Intel Processor Identification Utility
AMD Virtualization Compatibility Check Utility
** UPDATE **
Another option appears to be the solution from Lanamark. Lanamark Suite takes the raw hardware information from the operating system, normalizes it and fuses it with other key metrics from the Lanamark Central knowledge repository such as whether the processor is 64-bit and whether it has Intel VT / AMD-V extensions. Coupled with other key server information such as maximum memory supported and warranty remaining, also provided from the Lanamark Central, solution providers can help enterprises reduce the cost of virtualization solutions by helping them redeploy and upgrade existing servers.
Check out Lanamark's Suite for more information.