"Server manager has detected that the processor on this computer is not compatible with Hyper-V" Error While Enabling Hyper-V Role

If you receive the below error during the installation of Hyper-V role :

"Server manager has detected that the processor on this computer is not compatible with Hyper-V.  To install this roll, the processor must have a supported version of hardware-assisted virtualization and that feature must be turned on in the BIOS."

First make sure you have Hardware Assisted Virtualization and DEP turned on BIOS. If you still see this error message after enabling those roles make sure you didn't enable the role using :

start /w ocsetup Microsoft-Hyper-V

If so you need to first uninstall it (start /w ocsetup Microsoft-Hyper-V /uninstall) then install using the GUI (Server Manager -> Add Roles)