I have a Win 2008 R2 Data Center machine, and when I added the Hyper-V role, I got the following errors:
'Hypervisor' driver required by the Virtual Machine Management service is not installed or is disabled. Check your settings or try reinstalling the Hyper-V role.
Hyper-V launch failed; Either VMX not present or not enabled in BIOS.
ANy help would be appreciated as I am a n00b to the server world.
EDIT: This was a good resource: https://support.dell.com/support/edocs/software/HyperV/en/sov/sova00.pdf