I can't start a VM (any) on my Win 8 laptop. I tried re-installation of hyper-v with no success (uninstalled Hyper-V and checked with VMWare Player and it works, so it's not a hardware issue, I guess).
Here are requirements for Hyper-V :
Set these BIOS options to enable:
Set these BIOS options to disable:
Here are concise instructions needed to run Hyper-V. Please check it, it is very helpful in setting up Hyper-V.
Hyper-V Platform is available on Professional & Enterprise editions of Windows 8 only.