Use CPUID to get some processor details. If you have an Intel processor, you could look for support to the VT-x instruction.
Your first step however should be to check against the list Intel maintains to with details for all processors that support virtualization, here.
![cpuidcorei7m620[1] cpuidcorei7m620[1]](http://blog.gfst.net/image.axd?picture=cpuidcorei7m620%5B1%5D_thumb.png)
If you have an AMD processor, this AMD tool should help you determine whether your processor supports hardware virtualization or not.